15D sponge 30x40x2 cm ( 2 pcs /set)

Premium 15D biochemical filter sponge—two pieces per set, each 30x40x2 cm. Engineered for dual mechanical and biological filtration in freshwater and marine tanks. The high-porosity structure traps debris while offering expansive surface area for beneficial bacteria colonization, accelerating ammonia and nitrite breakdown. Maintains excellent water flow, cuts easily to fit any filter type, and withstands repeated rinses. Compatible with canister, sump, internal, and pond filtration systems. Durable, reusable, and essential for crystal-clear, healthy aquarium water.