A: Filter media—or the stuff in your filter that holds beneficial bacteria—come in a range of shapes, sizes and densities. Some are plastic balls; some are fibrous mats and blocks; some are plastic spiral-shaped things that more resemble fusilli than pond products. With all the different types of filter media, it's tough to decide which is best.
Well, we'll make it easy for you: Try a little of each type. Just like plants, different filtration media provide different amounts of water filtration, so we recommend a mix of media pads, like Matala Filter Media Pads, Filter media Pads By-The-Foot; ridged plastic balls, like The Pond Guy BioBalls; and curly plastic strips, like Bacti-Twist Biological/Mechanical Filter Media.
When choosing the filter media, regardless of type, look for these defining characteristics:
- Durability: Your media should be able to withstand wear and tear. The Pond Guy BioBalls are more durable and longer-lasting compared to similar products.
- Density: Your media should be the right density for your specific needs. Matala Filter Media Pads come in 4 densities to suit your particular pond.
- Surface area: Your media should also have a lot of surface area, which will result in more places for beneficial bacteria to grow.
Your filter media's density and surface area are particularly important because they determine how much beneficial bacteria grow and the rate at which water flows through the material. Dense material allows for more bacteria colonization, while less-dense material allows for more water flow. By using all different types of filter media, you're encouraging optimal biological and mechanical filtration—and that's always a good thing in an enclosed system.
Already have filter media in your system? You may be able to use it for another season or two, but first, give it a visual inspection. Is it beginning to wear on the edges? Has it compacted over the last few seasons? Worn or compressed material should be replaced to give your pond top-quality filtration, but fresh, fluffy material can be reused.