... bule ,green the bule ,green 3,MOQ:50pcs class A Koi pond filter media for fish garden (manufacture) Introduce The biological filter ... the environment is not endangered after disposal Usage :a,Koi pondb,Garden pond c,Aquarium tank D,Fish farm Specifications:1) Materials ... 38mm 880pcs 1000 x 2000 x 30mm 1000pcs class A Koi pond filter media for fish garden (manufacture)