Best Filter foam

  • Over 30 years of proven customer satisfaction with our green...
  • No chemicals used in production! Safe for all fresh or...
  • Easy to cut with scissors to any size needed.
  • The open cell sponge has a much larger inner surface area...
  • The reticulated structure also provides better flow rate of...
  • Cut to fit, can be used for any aquarium or pond filter,...
  • Over 30 years of proven customer satisfaction with our green...
  • No chemicals used in production! Safe for all fresh or...
  • Easy to cut with scissors to any size needed.
  • Hi-Flow Green Filter Foam Sheet
  • 12 Inches x 16 Inches x 5/8 Inch
  • Unlimited Potential for Use in Custom Applications
  • UNI bulk foam filter, this material is perfect for cutting...
  • Dimensions: 12" x 24" x 3/8"
  • UNI Part Number: BF-2
  • Eliminates dust and pollen from the air
  • Made from polyurethane foam, it is both washable and...
  • Cut foam down to any size

A garden pond is a beautiful thing. If goldfish or other animals are to live in a species-appropriate manner, the water must be clean and circulate. A pond filter is indispensable and must fit the size and volume of the pond. The interior consists of one or more filter foams and these fulfil important tasks.

Our Top Filter foam Pick

Aqua-Flo 12" Pond & Aquarium Filter Media, 72" (6 Feet) Long x 1" Thick (Green/White)
  • Over 30 years of proven customer satisfaction with our green filter product.
  • No chemicals used in production! Safe for all fresh or saltwater fish, tanks & ponds.
  • Easy to cut with scissors to any size needed.
  • Proudly Made in the USA by an American Company

Everything for animals: Filter foam Video Guide

Every fishpond needs a nutrient-poor water. If excess nutrients are produced, they will over time upset the ecological system. The organic particles must be removed from the pond water in a timely manner. This is the central task of a pond filter. Depending on the model, the filters differ in terms of appearance, price and interior. Modern and effective module filters do not consist of one filter foam, but of several foams arranged directly behind each other. The foams have pores of different sizes and filter coarse and fine dirt particles out of the water. Without the filter foams, the large, thread-producing algae particles would block the sensitive filter technology or damage the filter material. The filter foam is, however, not only extremely important for filtering the water, but also for bacteria.

The filter foam offers the important filter bacteria a large settlement area. These settle around 3 cm deep in the foam and then migrate through the fine or coarse-pored fabric of the foam. When the filter is in operation, a fine sludge is deposited on the foam. This serves the bacteria as an important nutrient. If several filter foams are used in one filter, they must be arranged correctly. Foams with larger pores pull all coarse dirt particles out of the pond water. What does not stick to the foams is then pulled out of the water by the sponges with the smaller pores. In spring the pond water is still cold and therefore the bacteria do not work so effectively. For this reason, the sediment is coarse and the dirt particles are increasingly deposited on the coarse-pored filter foams.

Each filter foam has pores of different sizes. The pore size plays an important role in the efficient operation of the filter. If the filter foam is used incorrectly or has too small pores, its surface closes too quickly and no water can get through. Such a case leads to problems during operation. The pore size shall be expressed in the unit ‘ppi’ and either in inch or inch. A filter foam with a pore size of 50 ppi (pores per inch) is much finer than a swarm with a width of only 10 ppi. Foams with a smaller number of pores are suitable for coarser dirt particles. A filter foam with 50 ppi has 50 pores and is suitable for smaller particles.

Commercial filter foams differ in size (in cm), colour and number of pores (ppi). Some manufacturers use the terms filter mat or filter sponge instead of filter foam. Modern filter foams are manufactured using a special high-pressure process and consist of open-pore foam. Such a filter foam is suitable for freshwater aquariums, garden ponds and seawater aquariums. The filter foam can be used in both mechanical and biological filters (for the colonisation of bacterial cultures) and can be cut to an individually suitable size. This is necessary when whole foam boards are bought in the trade. However, the filter foam should never be bought used. If filter foam is needed for a Japanese Koi pond, this must meet strict requirements. The Japanese fish are much more sensitive than goldfish and need a very good water climate.

TOP 5 Filter foam Bestseller

Aqua-Flo 12" Pond & Aquarium Filter Media, 72" (6 Feet) Long x 1" Thick (Green/White)
  • Over 30 years of proven customer satisfaction with our green filter product.
  • No chemicals used in production! Safe for all fresh or saltwater fish, tanks & ponds.
  • Easy to cut with scissors to any size needed.
  • Proudly Made in the USA by an American Company
AQUANEAT Reticulated Open Cell Foam Sponge Filter Media Aquarium Fish HMF Sump 11" Fine
  • The open cell sponge has a much larger inner surface area for beneficial biological capacity
  • The reticulated structure also provides better flow rate of water and less chance of clog.
  • Cut to fit, can be used for any aquarium or pond filter, sump, wet/dry, canister, power filter etc. or your HMF DIY project.
  • The size of pores is measure in pores per inch (PPI). The sponge with higher PPI has more pores in it. More pores means larger biological filtration capacity but with less water flow through rate and needs to be cleaned more often. It is recommended to use combination of sponge with difference PPI to get the best result.
  • Dimension: 11" Lx 10.25"W x 2"H; PPI: 40 Fine Pad
AQUANEAT Bio Sponge Filter Media Pad Cut-to-fit Foam Up to 23" for Aquarium Fish Tank (23.6"x17"x2" Black (Fine))
  • Cut-To-Fit filter media Bio Sponge. Can be cut to fit your filters
  • Size: 23.6"x 17"x 2"
  • Good for both biological and mechanical filtration - offers more surface area for the beneficial nitrifying bacteria to colonize, eliminate toxic compounds and improve water quality ; trap large bits of waste, and will not get clogged easily
Uni Filter BF1 12" X 16" X 5/8" 65-PPI Green Fine Foam
  • Hi-Flow Green Filter Foam Sheet
  • 12 Inches x 16 Inches x 5/8 Inch
  • Unlimited Potential for Use in Custom Applications
  • Excellent Air Flow and Filtration
  • Sold Per Sheet
Uni Filter BF-2 12" X 24" X 3/8" 30-PPI Black Coarse Foam
  • UNI bulk foam filter, this material is perfect for cutting and fitting to your stock air filter housing, replace old paper filter elements with new serviceable foam!
  • Dimensions: 12" x 24" x 3/8"
  • UNI Part Number: BF-2
  • Bulk Filter foam: Coarse (30 PPI)