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A huge range of pumps for household, commercial, agricultural and industrial use

Floating Fountains & Dam Aerators

Floating Fountains and Aerators for Dams, Lakes and Large Ponds

Pond Help & Information

Need a hand working out the right gear for your project? Browse our range of help pages or submit a help request directly to our specialists.

Blagdon Minipond and Midipond Gravity Filters

Blagdon have a terriffic range of gravity filters suitable for domestic ponds. The gravity filters sit up above the water level of your pond. Your pond pump then pumps the water from the pond up into the gravity filter. They are a terrific alternative to a pressure filter as they can hold large amounts of waste and are much easier to clean out. The Blagdon Minipond and Midipond have included a suitably sized Ultra Violet Clarifier which helps to control algae. Each filter also has 3 different grades of foam filter pads which help to remove dirt and waste. Ceramic biological filter media help to prevent the build up of harmful toxins in your pond water.

  • Integrated Ultra Violet Clarifier to kill green algae that is suspended in the water and keep it looking crystal clear
  • 3 different grades of foam filter pads to remove sediment (mechanical filtration)
  • Wool pad for finer filtration
  • Carbon pad to reduce toxicity and remove chemical pollutants
  • Bionoodles which create an ideal place for nitrifying bacteria to live, which breaks down ammonia and other toxic substances to help with the nitrogen cycle of your pond (biological filtration)
  • Large hinged lid, unpressurised so you can simply lift it up and take out the filter sponges to clean
  • Replacement UV Lamps, Filter Sponges, Wool/Carbon Pads as well as other spare parts readily available
  • Replacement bio-noodles also available
  • Large filter housing holds a lot of waste before needing to be cleaned
  • Ideal for dirty fish such as Koi or heavier fish stocking since they are much easier to empty out the waste
  • Simple Blagdon Pond Kits are available including pump, matching filter, hose and fittings - click here

Aussie's Observations about  Minipond and Midipond Gravity Filters

Budget • Good • Better • Best • Superior

Any pond where you can place the filter box above the water level. The best kind of filter for Koi.

Construction is superb as is the filter layout and number, quality from top to bottom. Very good value. This is a great large capacity gravity filter.

If pumping up to a waterfall it can be difficult to position a gravity filter above it, best to use a pressure filter in this instance.

Product Price Filter TypeIdeal Flowlitres per hourMin Flowlitres per hourMax Flow L/Hourlitres per hourPond Max Vol (No Fish)litresPond Max Vol (With Fish)litresDimensionsL x W x H (mm)Back Wash SystemUVC FittedUltra violet lamp fitted as standardWarranty YearsCleaning IndicatorCanister Above GroundIf canister buried, how much shows above ground?Foam FiltersBio BallsFor micro-organism growthPower Cord LengthHose Tails SuppliedHose Tails OptionalMax Pump Pressure
Blagdon Midipond 10000 Gravity Filter Gravity Filter with UVC
Not available
Gravity370035005000100005600520x470x400No18w2NoYesYes532mm Inlet / 3 x 38mm Outlet
Blagdon Midipond 14000 Gravity Filter Gravity Filter with UVC
Not available
Gravity550035008000140007800520x470x400No24w2NoYesYes532mm Inlet / 4 x 38mm Outlet

Filter selection

To choose the ideal filter for any pond you must first know the correct flow through the filter to maintain ideal water quality for your pond. (Please remember that the pond size alone does not determine the filter or pump size without first taking into account the many environmental and physical factors) 
3 ways to get help to establish flow

  1. Fill in one of our e-mail help forms and let us do all the calculations for you
  2. Give us a call 1800 607 388 for expert advice
  3. Do it yourself and use our quick reference flow calculator for rough estimate
  • Step one: Establish the required flow through the filter keeping in mind waterfall** height if any, or long hose**
  • Step Two: Choose a filter from the chart below (Example if your pond requires a flow through the filter of 2,400 litres per hour, the Minipond 6000 would give the best result)
  • Step Three: Choose a pump, they are listed below in order of quality and suitability


Recommend Flow Rates Through Filter - Litres per Hour

Model Number --> 4500 6000 10000 14000
Minimum Flow 1350 1800 2500 3500
Ideal Flow (See hint 4) 1800 2400 3700 5500
Maximum Flow 2250 3000 5000 8000


Suggested Pumps

Model Number --> 4500 6000 10000 14000
Suitable pumps (assuming no waterfall, filter located approx 1m from pond or less at ground level)

Laguna Maxflo 2200

Oase Aquamax Eco Classic 2500


Laguna Maxflo 4000

Oase Aquamax Eco Classic 3500

Aquagarden Barracuda 4000

Tornado Multi 3000

Laguna Maxflo 5000

Oase Aquamax Eco Classic 5500

Tornado Multi 6000

Laguna Maxflo 7600

Oase Aquamax Eco Classic 8500

Aquagarden Barracuda 6000

Oase Aquamax Eco Premium 8000

Tornado Multi 8000


Pond Sizes

Model Number --> 4500 6000 10000 14000

No Fish

4500 6000 10000 14000
Some Fish 3350 4500 7500 10500
Medium Fish 2500 3350 5600 7800
Lots of Fish 1250 1700 2800 3900
Koi & Turtles 1250 1700 2800 3900

No fish - Near natural garden ponds with plant zones, without fish.
Some fish - Garden pond with plants and fish stock of 40cm per 1,000 litres
Medium fish - Garden pond with plants and fish stock of up to 60cm per 1,000 litres
Lots of fish -Garden pond with plants and fish stock of up to 80cm per 1,000 litres

Aussie's additional thoughts
Tip 1: When calculating flow,  always allow about a 15% flow loss
Tip 2:Place the pump at the opposite end of the pond to the water return, and in the deepest part of the pond
Tip 3: Interpet offer a chemical to prime filter systems, a great way to hasten biological activity Interpet Bio start
Tip 4: If in doubt always choose a pump with less than the maximum recommended flow  Within reason the slower the water passes over the UV lamp and through the filter the better the result. However, you can never have too much pond flow, so, by having a slightly oversize pump and releasing water directly back into the pond or on to a feature or waterfall through a "Tee" with a flow valve, added circulation is provided for the pond.