Blue Sponge for SunSun HW-303 and 303B
A set of 2 pieces
The original contribution to the iconic HW-303 and 303B. The appropriate density sponge ensures quick water purification from any mechanical impurities. Even small fractions are caught out of the water. The sponge is also a material on which useful strains of bacteria that are responsible for biological filtration in your bucket can grow.
The set contains 2 pcs.
The thickness of 1 pc is 2cm.
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