1,Stardand size :100*200*38cm 2,color :sky bule ,deep bule ,green the bule ,green 3,MOQ:50pcs class A Koi pond filter media for fish garden (manufacture) Introduce The biological filter media has an ideal surface to hold nitrifying bacteria, changing toxic ammoniac and nitrites into harmless The biological filter mat has an ideal surface to hold nitrifyingbacteria, changing toxic ammoniac and ...