Conventional power filter: Place Poly-Filter on bottom plate. Cover with gravel or floss. Do not res
Plastic undergravel filters: Place Poly-Filter on top of the undergravel plate. Cover filter and pla
Canister-type power filters: Place Poly-Filter in the chemical filter compartment. Add floss accordi
POLYBIO POLY FILTER PAD 4 X 8"
Poly-Bio-Marine POLYBIO POLY FILTER PAD 4 X 8 - B00025664C