Filter materials

Filter media to fill or upgrade a pond filter, including a homemade one: filter brushes, biological media, ceramics, zeolite, lava rock, activated carbon and filter wool. Choose by filter stage: mechanical, biological or chemical.

How to choose a filter medium?

• Mechanical filtration: brushes and filter wool trap particles first.
• Biological filtration: ceramics (Biocerapond), Bioblocks, Bio-Balls or SuperBio offer bacteria a large surface area.
• Targeted use: zeolite for ammonium, activated carbon after a treatment, PhosLess for phosphates.
• Volume: bags from 10 to 50 L depending on filter size; rinse biological media in pond water to preserve the bacteria.

Read: how many filter brushes you need. See also filter brushes and filter foams.