Ocean Free Japanese Filter Mat Koi Pond Filter Media for Garden Ponds, Koi Pond & Sump (Size : 20″ x 20x 2)

This product is suitable for sea water, fresh water, water grass tank, size can be cut freely.

It is suitable for cultivating nitrifying bacteria through expert analysis.

Biochemical cotton can decompose excreta and feed residue, improve water quality and clean filtration. The effect is good and the mortality of fish is reduced.

Cleaning once a month, no blocking, no deformation, can be reused after cleaning.