Home Fluval Pressure-Flo 21000 Pressurised Pond Filter with 36W UVC
Fluval Pond Pressure-Flo Pressurized UV Pond Filter and packaging
Fluval Pond Pressure-Flo filter easy-clean system diagram with pump handles and indicator.
Fluval Pond Pressure-Flo filter shown installed above and below ground for a garden pond.
Fluval Pond equipment size chart for Pressure-Flo filters and Max-Flo pumps based on pond volume.
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Fluval Pond Pressure-Flo Pressurized UV Pond Filter and packaging
Fluval Pond Pressure-Flo filter easy-clean system diagram with pump handles and indicator.
Fluval Pond Pressure-Flo filter shown installed above and below ground for a garden pond.
Fluval Pond equipment size chart for Pressure-Flo filters and Max-Flo pumps based on pond volume.

Fluval Pressure-Flo 21000 Pressurised Pond Filter with 36W UVC

$1,199.00

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Description

The Fluval Pressure-Flo 21000 is the largest model in the Pressure-Flo range, designed for substantial garden and fish ponds up to approximately 21,000 litres.

It combines mechanical foam filtration, 4,800g of BioLava biological filter media and a powerful 36W UVC clarifier to provide effective multi-stage pond filtration in one pressurised external unit.

Key Features

  • Suitable for ponds up to approximately 21,000 litres
  • Powerful 36W UVC
  • Includes 4,800g of BioLava
  • High-capacity mechanical filtration
  • Biological filtration
  • Helps control green pond water
  • Pressurised filter design
  • Integrated easy-clean backwash system
  • Cleaning indicator
  • Mode selector
  • Drain outlet
  • Suitable for larger freshwater ponds
  • Recommended with Fluval Max-Flo 16500

High-Capacity Pond Filtration

The Pressure-Flo 21000 is designed for larger ponds where substantially more filtration capacity is required.

Mechanical foams capture suspended waste while the large quantity of BioLava provides extensive biological filtration surface area for beneficial bacteria.

Powerful 36W UVC Clarification

The integrated 36W UVC helps control suspended algae responsible for green water.

Combined with mechanical and biological filtration, this provides a comprehensive filtration system for larger ponds.

Easy-Clean System

Despite its larger size, the Pressure-Flo 21000 incorporates Fluval's convenient cleaning system.

The cleaning handles operate internal cleaning blades that help remove waste from the foam filters. Dirty water can then be discharged through the dedicated drain outlet.

Recommended Pump – Fluval Max-Flo 16500

Fluval recommends pairing the Pressure-Flo 21000 with the Fluval Max-Flo 16500 Waterfall & Filter Pump.

View the Fluval Max-Flo 16500 Waterfall & Filter Pump

The Max-Flo transports pond water and suitable suspended debris to the Pressure-Flo for filtration before the cleaned water is returned to the pond.

Specifications

  • Brand: Fluval
  • Range: Pressure-Flo
  • Model: 21000
  • Product Number: PT8358
  • Maximum Pond Capacity: 21,000L
  • Dimensions: 37.7cm diameter × 65.3cm high
  • Canister Volume: 40L
  • UVC: 36W
  • BioLava: 4,800g
  • Recommended Pump: Fluval Max-Flo 16500
  • Maximum Operating Pressure: 0.05 MPa
  • Filter Type: Pressurised external pond filter
  • Application: Large freshwater garden and fish ponds

 

Choosing the Correct Filter

The 21,000L figure is a maximum pond-volume guide.

Larger filtration capacity may be advisable where the pond has:

  • Heavy fish stocking
  • High feeding rates
  • Strong direct sunlight
  • Large koi or other high-waste fish
  • Heavy organic debris
  • Warm operating conditions

Maintenance

To maintain efficient filtration:

  • Clean the filter foams regularly
  • Rinse BioLava in pond water as required
  • Inspect the UVC lamp
  • Clean the quartz sleeve
  • Check seals and hose fittings
  • Use the backwash system whenever the cleaning indicator shows increased restriction

Frequently Asked Questions

What size pond does the Pressure-Flo 21000 suit?
It is rated for ponds up to approximately 21,000 litres.

What size UVC is included?
The Pressure-Flo 21000 contains a 36W UVC clarifier.

Does it include biological filtration?
Yes. It contains 4,800g of BioLava biological filtration media.

Which pump should be used with the Pressure-Flo 21000?
Fluval recommends the Max-Flo 16500.

View the Fluval Max-Flo 16500

Can it be used with a waterfall?
Yes. Because it is pressurised, filtered water can be directed towards an appropriately designed waterfall or other return point.

Explore Fluval Pond Products

Looking for more pond equipment? Browse our complete range of Fluval Max-Flo pumps, Pressure-Flo filters and Jet Clear water clarifiers.

View the Full Range of Fluval Pond Products

Reviews
Description

The Fluval Pressure-Flo 21000 is the largest model in the Pressure-Flo range, designed for substantial garden and fish ponds up to approximately 21,000 litres.

It combines mechanical foam filtration, 4,800g of BioLava biological filter media and a powerful 36W UVC clarifier to provide effective multi-stage pond filtration in one pressurised external unit.

Key Features

  • Suitable for ponds up to approximately 21,000 litres
  • Powerful 36W UVC
  • Includes 4,800g of BioLava
  • High-capacity mechanical filtration
  • Biological filtration
  • Helps control green pond water
  • Pressurised filter design
  • Integrated easy-clean backwash system
  • Cleaning indicator
  • Mode selector
  • Drain outlet
  • Suitable for larger freshwater ponds
  • Recommended with Fluval Max-Flo 16500

High-Capacity Pond Filtration

The Pressure-Flo 21000 is designed for larger ponds where substantially more filtration capacity is required.

Mechanical foams capture suspended waste while the large quantity of BioLava provides extensive biological filtration surface area for beneficial bacteria.

Powerful 36W UVC Clarification

The integrated 36W UVC helps control suspended algae responsible for green water.

Combined with mechanical and biological filtration, this provides a comprehensive filtration system for larger ponds.

Easy-Clean System

Despite its larger size, the Pressure-Flo 21000 incorporates Fluval's convenient cleaning system.

The cleaning handles operate internal cleaning blades that help remove waste from the foam filters. Dirty water can then be discharged through the dedicated drain outlet.

Recommended Pump – Fluval Max-Flo 16500

Fluval recommends pairing the Pressure-Flo 21000 with the Fluval Max-Flo 16500 Waterfall & Filter Pump.

View the Fluval Max-Flo 16500 Waterfall & Filter Pump

The Max-Flo transports pond water and suitable suspended debris to the Pressure-Flo for filtration before the cleaned water is returned to the pond.

Specifications

  • Brand: Fluval
  • Range: Pressure-Flo
  • Model: 21000
  • Product Number: PT8358
  • Maximum Pond Capacity: 21,000L
  • Dimensions: 37.7cm diameter × 65.3cm high
  • Canister Volume: 40L
  • UVC: 36W
  • BioLava: 4,800g
  • Recommended Pump: Fluval Max-Flo 16500
  • Maximum Operating Pressure: 0.05 MPa
  • Filter Type: Pressurised external pond filter
  • Application: Large freshwater garden and fish ponds

 

Choosing the Correct Filter

The 21,000L figure is a maximum pond-volume guide.

Larger filtration capacity may be advisable where the pond has:

  • Heavy fish stocking
  • High feeding rates
  • Strong direct sunlight
  • Large koi or other high-waste fish
  • Heavy organic debris
  • Warm operating conditions

Maintenance

To maintain efficient filtration:

  • Clean the filter foams regularly
  • Rinse BioLava in pond water as required
  • Inspect the UVC lamp
  • Clean the quartz sleeve
  • Check seals and hose fittings
  • Use the backwash system whenever the cleaning indicator shows increased restriction

Frequently Asked Questions

What size pond does the Pressure-Flo 21000 suit?
It is rated for ponds up to approximately 21,000 litres.

What size UVC is included?
The Pressure-Flo 21000 contains a 36W UVC clarifier.

Does it include biological filtration?
Yes. It contains 4,800g of BioLava biological filtration media.

Which pump should be used with the Pressure-Flo 21000?
Fluval recommends the Max-Flo 16500.

View the Fluval Max-Flo 16500

Can it be used with a waterfall?
Yes. Because it is pressurised, filtered water can be directed towards an appropriately designed waterfall or other return point.

Explore Fluval Pond Products

Looking for more pond equipment? Browse our complete range of Fluval Max-Flo pumps, Pressure-Flo filters and Jet Clear water clarifiers.

View the Full Range of Fluval Pond Products

Reviews
Fluval Pressure-Flo 21000 Pressurised Pond Filter with 36W UVC
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{"id":9967654502645,"title":"Fluval Pressure-Flo 21000 Pressurised Pond Filter with 36W UVC","handle":"fluval-pressure-flo-21000-pond-filter-36w-uvc","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong\u003eFluval Pressure-Flo 21000\u003c\/strong\u003e is the largest model in the Pressure-Flo range, designed for substantial garden and fish ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIt combines mechanical foam filtration, \u003cstrong\u003e4,800g of BioLava biological filter media\u003c\/strong\u003e and a powerful \u003cstrong\u003e36W UVC clarifier\u003c\/strong\u003e to provide effective multi-stage pond filtration in one pressurised external unit. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePowerful \u003cstrong\u003e36W UVC\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIncludes \u003cstrong\u003e4,800g of BioLava\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-capacity mechanical filtration\u003c\/li\u003e\n\u003cli\u003eBiological filtration\u003c\/li\u003e\n\u003cli\u003eHelps control green pond water\u003c\/li\u003e\n\u003cli\u003ePressurised filter design\u003c\/li\u003e\n\u003cli\u003eIntegrated easy-clean backwash system\u003c\/li\u003e\n\u003cli\u003eCleaning indicator\u003c\/li\u003e\n\u003cli\u003eMode selector\u003c\/li\u003e\n\u003cli\u003eDrain outlet\u003c\/li\u003e\n\u003cli\u003eSuitable for larger freshwater ponds\u003c\/li\u003e\n\u003cli\u003eRecommended with \u003cstrong\u003eFluval Max-Flo 16500\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHigh-Capacity Pond Filtration\u003c\/h3\u003e\n\u003cp\u003eThe Pressure-Flo 21000 is designed for larger ponds where substantially more filtration capacity is required.\u003c\/p\u003e\n\u003cp\u003eMechanical foams capture suspended waste while the large quantity of BioLava provides extensive biological filtration surface area for beneficial bacteria.\u003c\/p\u003e\n\u003ch3\u003ePowerful 36W UVC Clarification\u003c\/h3\u003e\n\u003cp\u003eThe integrated \u003cstrong\u003e36W UVC\u003c\/strong\u003e helps control suspended algae responsible for green water.\u003c\/p\u003e\n\u003cp\u003eCombined with mechanical and biological filtration, this provides a comprehensive filtration system for larger ponds.\u003c\/p\u003e\n\u003ch3\u003eEasy-Clean System\u003c\/h3\u003e\n\u003cp\u003eDespite its larger size, the Pressure-Flo 21000 incorporates Fluval's convenient cleaning system.\u003c\/p\u003e\n\u003cp\u003eThe cleaning handles operate internal cleaning blades that help remove waste from the foam filters. Dirty water can then be discharged through the dedicated drain outlet. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eRecommended Pump – Fluval Max-Flo 16500\u003c\/h3\u003e\n\u003cp\u003eFluval recommends pairing the Pressure-Flo 21000 with the \u003cstrong\u003eFluval Max-Flo 16500 Waterfall \u0026amp; Filter Pump\u003c\/strong\u003e. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003eView the \u003c\/a\u003e\u003ca href=\"https:\/\/www.amazingamazon.com.au\/products\/fluval-max-flo-16500-waterfall-filter-pump\" title=\"Fluval Max Flo Pump 16500\"\u003eFluval Max-Flo 16500 Waterfall \u0026amp; Filter Pump\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe Max-Flo transports pond water and suitable suspended debris to the Pressure-Flo for filtration before the cleaned water is returned to the pond.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fluval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange:\u003c\/strong\u003e Pressure-Flo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 21000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e PT8358\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Pond Capacity:\u003c\/strong\u003e \u003cstrong\u003e21,000L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e \u003cstrong\u003e37.7cm diameter × 65.3cm high\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCanister Volume:\u003c\/strong\u003e \u003cstrong\u003e40L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUVC:\u003c\/strong\u003e \u003cstrong\u003e36W\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioLava:\u003c\/strong\u003e \u003cstrong\u003e4,800g\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Pump:\u003c\/strong\u003e Fluval Max-Flo 16500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e \u003cstrong\u003e0.05 MPa\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Type:\u003c\/strong\u003e Pressurised external pond filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Large freshwater garden and fish ponds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eChoosing the Correct Filter\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e21,000L\u003c\/strong\u003e figure is a maximum pond-volume guide.\u003c\/p\u003e\n\u003cp\u003eLarger filtration capacity may be advisable where the pond has:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy fish stocking\u003c\/li\u003e\n\u003cli\u003eHigh feeding rates\u003c\/li\u003e\n\u003cli\u003eStrong direct sunlight\u003c\/li\u003e\n\u003cli\u003eLarge koi or other high-waste fish\u003c\/li\u003e\n\u003cli\u003eHeavy organic debris\u003c\/li\u003e\n\u003cli\u003eWarm operating conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaintenance\u003c\/h3\u003e\n\u003cp\u003eTo maintain efficient filtration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClean the filter foams regularly\u003c\/li\u003e\n\u003cli\u003eRinse BioLava in pond water as required\u003c\/li\u003e\n\u003cli\u003eInspect the UVC lamp\u003c\/li\u003e\n\u003cli\u003eClean the quartz sleeve\u003c\/li\u003e\n\u003cli\u003eCheck seals and hose fittings\u003c\/li\u003e\n\u003cli\u003eUse the backwash system whenever the cleaning indicator shows increased restriction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size pond does the Pressure-Flo 21000 suit?\u003c\/strong\u003e\u003cbr\u003eIt is rated for ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size UVC is included?\u003c\/strong\u003e\u003cbr\u003eThe Pressure-Flo 21000 contains a \u003cstrong\u003e36W UVC clarifier\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include biological filtration?\u003c\/strong\u003e\u003cbr\u003eYes. It contains \u003cstrong\u003e4,800g of BioLava\u003c\/strong\u003e biological filtration media.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich pump should be used with the Pressure-Flo 21000?\u003c\/strong\u003e\u003cbr\u003eFluval recommends the \u003cstrong\u003eMax-Flo 16500\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003eView the Fluval Max-Flo 16500\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used with a waterfall?\u003c\/strong\u003e\u003cbr\u003eYes. Because it is pressurised, filtered water can be directed towards an appropriately designed waterfall or other return point.\u003c\/p\u003e\n\u003ch3\u003eExplore Fluval Pond Products\u003c\/h3\u003e\n\u003cp\u003eLooking for more pond equipment? Browse our complete range of \u003cstrong\u003eFluval Max-Flo pumps, Pressure-Flo filters and Jet Clear water clarifiers\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/www.amazingamazon.com.au\/collections\/fluval-pond-products\"\u003eView the Full Range of Fluval Pond Products\u003c\/a\u003e\u003c\/p\u003e","published_at":"2026-08-26T14:34:55+10:00","created_at":"2026-08-26T14:30:26+10:00","vendor":"Fluval","type":"","tags":[],"price":119900,"price_min":119900,"price_max":119900,"available":false,"price_varies":false,"compare_at_price":null,"compare_at_price_min":0,"compare_at_price_max":0,"compare_at_price_varies":false,"variants":[{"id":48770522382581,"title":"Default Title","option1":"Default Title","option2":null,"option3":null,"sku":"FVL81","requires_shipping":true,"taxable":true,"featured_image":null,"available":false,"name":"Fluval Pressure-Flo 21000 Pressurised Pond Filter with 36W UVC","public_title":null,"options":["Default Title"],"price":119900,"weight":10000,"compare_at_price":null,"inventory_management":"shopify","barcode":"0015561283588","requires_selling_plan":false,"selling_plan_allocations":[],"quantity_rule":{"min":1,"max":null,"increment":1}}],"images":["\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/fluval-pressure-flo.jpg?v=1787715022","\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/04-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715033","\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/06-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715047","\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/09-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715072"],"featured_image":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/fluval-pressure-flo.jpg?v=1787715022","options":["Title"],"media":[{"alt":"Fluval Pond Pressure-Flo Pressurized UV Pond Filter and packaging","id":39900345729269,"position":1,"preview_image":{"aspect_ratio":1.0,"height":2000,"width":2000,"src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/fluval-pressure-flo.jpg?v=1787715022"},"aspect_ratio":1.0,"height":2000,"media_type":"image","src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/fluval-pressure-flo.jpg?v=1787715022","width":2000},{"alt":"Fluval Pond Pressure-Flo filter easy-clean system diagram with pump handles and indicator.","id":39900346220789,"position":2,"preview_image":{"aspect_ratio":1.014,"height":1026,"width":1040,"src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/04-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715033"},"aspect_ratio":1.014,"height":1026,"media_type":"image","src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/04-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715033","width":1040},{"alt":"Fluval Pond Pressure-Flo filter shown installed above and below ground for a garden pond.","id":39900346417397,"position":3,"preview_image":{"aspect_ratio":1.014,"height":1026,"width":1040,"src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/06-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715047"},"aspect_ratio":1.014,"height":1026,"media_type":"image","src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/06-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715047","width":1040},{"alt":"Fluval Pond equipment size chart for Pressure-Flo filters and Max-Flo pumps based on pond volume.","id":39900347826421,"position":4,"preview_image":{"aspect_ratio":1.014,"height":1026,"width":1040,"src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/09-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715072"},"aspect_ratio":1.014,"height":1026,"media_type":"image","src":"\/\/www.amazingamazon.com.au\/cdn\/shop\/files\/09-fluval-pt8350-pt8352-pt8354-pt8358-pressure-flo.jpg?v=1787715072","width":1040}],"requires_selling_plan":false,"selling_plan_groups":[],"content":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe \u003cstrong\u003eFluval Pressure-Flo 21000\u003c\/strong\u003e is the largest model in the Pressure-Flo range, designed for substantial garden and fish ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eIt combines mechanical foam filtration, \u003cstrong\u003e4,800g of BioLava biological filter media\u003c\/strong\u003e and a powerful \u003cstrong\u003e36W UVC clarifier\u003c\/strong\u003e to provide effective multi-stage pond filtration in one pressurised external unit. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eKey Features\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003eSuitable for ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003ePowerful \u003cstrong\u003e36W UVC\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eIncludes \u003cstrong\u003e4,800g of BioLava\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003eHigh-capacity mechanical filtration\u003c\/li\u003e\n\u003cli\u003eBiological filtration\u003c\/li\u003e\n\u003cli\u003eHelps control green pond water\u003c\/li\u003e\n\u003cli\u003ePressurised filter design\u003c\/li\u003e\n\u003cli\u003eIntegrated easy-clean backwash system\u003c\/li\u003e\n\u003cli\u003eCleaning indicator\u003c\/li\u003e\n\u003cli\u003eMode selector\u003c\/li\u003e\n\u003cli\u003eDrain outlet\u003c\/li\u003e\n\u003cli\u003eSuitable for larger freshwater ponds\u003c\/li\u003e\n\u003cli\u003eRecommended with \u003cstrong\u003eFluval Max-Flo 16500\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eHigh-Capacity Pond Filtration\u003c\/h3\u003e\n\u003cp\u003eThe Pressure-Flo 21000 is designed for larger ponds where substantially more filtration capacity is required.\u003c\/p\u003e\n\u003cp\u003eMechanical foams capture suspended waste while the large quantity of BioLava provides extensive biological filtration surface area for beneficial bacteria.\u003c\/p\u003e\n\u003ch3\u003ePowerful 36W UVC Clarification\u003c\/h3\u003e\n\u003cp\u003eThe integrated \u003cstrong\u003e36W UVC\u003c\/strong\u003e helps control suspended algae responsible for green water.\u003c\/p\u003e\n\u003cp\u003eCombined with mechanical and biological filtration, this provides a comprehensive filtration system for larger ponds.\u003c\/p\u003e\n\u003ch3\u003eEasy-Clean System\u003c\/h3\u003e\n\u003cp\u003eDespite its larger size, the Pressure-Flo 21000 incorporates Fluval's convenient cleaning system.\u003c\/p\u003e\n\u003cp\u003eThe cleaning handles operate internal cleaning blades that help remove waste from the foam filters. Dirty water can then be discharged through the dedicated drain outlet. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003ch3\u003eRecommended Pump – Fluval Max-Flo 16500\u003c\/h3\u003e\n\u003cp\u003eFluval recommends pairing the Pressure-Flo 21000 with the \u003cstrong\u003eFluval Max-Flo 16500 Waterfall \u0026amp; Filter Pump\u003c\/strong\u003e. \u003cspan class=\"contents\"\u003e\u003cspan class=\"\"\u003e\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003eView the \u003c\/a\u003e\u003ca href=\"https:\/\/www.amazingamazon.com.au\/products\/fluval-max-flo-16500-waterfall-filter-pump\" title=\"Fluval Max Flo Pump 16500\"\u003eFluval Max-Flo 16500 Waterfall \u0026amp; Filter Pump\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003eThe Max-Flo transports pond water and suitable suspended debris to the Pressure-Flo for filtration before the cleaned water is returned to the pond.\u003c\/p\u003e\n\u003ch3\u003eSpecifications\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e Fluval\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRange:\u003c\/strong\u003e Pressure-Flo\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eModel:\u003c\/strong\u003e 21000\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eProduct Number:\u003c\/strong\u003e PT8358\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Pond Capacity:\u003c\/strong\u003e \u003cstrong\u003e21,000L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eDimensions:\u003c\/strong\u003e \u003cstrong\u003e37.7cm diameter × 65.3cm high\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCanister Volume:\u003c\/strong\u003e \u003cstrong\u003e40L\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eUVC:\u003c\/strong\u003e \u003cstrong\u003e36W\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBioLava:\u003c\/strong\u003e \u003cstrong\u003e4,800g\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eRecommended Pump:\u003c\/strong\u003e Fluval Max-Flo 16500\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eMaximum Operating Pressure:\u003c\/strong\u003e \u003cstrong\u003e0.05 MPa\u003c\/strong\u003e\n\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eFilter Type:\u003c\/strong\u003e Pressurised external pond filter\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eApplication:\u003c\/strong\u003e Large freshwater garden and fish ponds\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003ch3\u003eChoosing the Correct Filter\u003c\/h3\u003e\n\u003cp\u003eThe \u003cstrong\u003e21,000L\u003c\/strong\u003e figure is a maximum pond-volume guide.\u003c\/p\u003e\n\u003cp\u003eLarger filtration capacity may be advisable where the pond has:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eHeavy fish stocking\u003c\/li\u003e\n\u003cli\u003eHigh feeding rates\u003c\/li\u003e\n\u003cli\u003eStrong direct sunlight\u003c\/li\u003e\n\u003cli\u003eLarge koi or other high-waste fish\u003c\/li\u003e\n\u003cli\u003eHeavy organic debris\u003c\/li\u003e\n\u003cli\u003eWarm operating conditions\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eMaintenance\u003c\/h3\u003e\n\u003cp\u003eTo maintain efficient filtration:\u003c\/p\u003e\n\u003cul\u003e\n\u003cli\u003eClean the filter foams regularly\u003c\/li\u003e\n\u003cli\u003eRinse BioLava in pond water as required\u003c\/li\u003e\n\u003cli\u003eInspect the UVC lamp\u003c\/li\u003e\n\u003cli\u003eClean the quartz sleeve\u003c\/li\u003e\n\u003cli\u003eCheck seals and hose fittings\u003c\/li\u003e\n\u003cli\u003eUse the backwash system whenever the cleaning indicator shows increased restriction\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eFrequently Asked Questions\u003c\/h3\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size pond does the Pressure-Flo 21000 suit?\u003c\/strong\u003e\u003cbr\u003eIt is rated for ponds up to approximately \u003cstrong\u003e21,000 litres\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhat size UVC is included?\u003c\/strong\u003e\u003cbr\u003eThe Pressure-Flo 21000 contains a \u003cstrong\u003e36W UVC clarifier\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eDoes it include biological filtration?\u003c\/strong\u003e\u003cbr\u003eYes. It contains \u003cstrong\u003e4,800g of BioLava\u003c\/strong\u003e biological filtration media.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eWhich pump should be used with the Pressure-Flo 21000?\u003c\/strong\u003e\u003cbr\u003eFluval recommends the \u003cstrong\u003eMax-Flo 16500\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link cursor-pointer\"\u003eView the Fluval Max-Flo 16500\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eCan it be used with a waterfall?\u003c\/strong\u003e\u003cbr\u003eYes. Because it is pressurised, filtered water can be directed towards an appropriately designed waterfall or other return point.\u003c\/p\u003e\n\u003ch3\u003eExplore Fluval Pond Products\u003c\/h3\u003e\n\u003cp\u003eLooking for more pond equipment? Browse our complete range of \u003cstrong\u003eFluval Max-Flo pumps, Pressure-Flo filters and Jet Clear water clarifiers\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003e\u003ca rel=\"noopener\" class=\"decorated-link\" href=\"https:\/\/www.amazingamazon.com.au\/collections\/fluval-pond-products\"\u003eView the Full Range of Fluval Pond Products\u003c\/a\u003e\u003c\/p\u003e"}