Install at inlet of Hang-on Filter, Canister Filter, etc.
Prevents fish and shrimp from being sucked into the filter.
Functions as prefilter to remove large leaves or debris.
Can be easily cleaned and reused.
Stretchable
Change sponge when it loses its elasticity.

Sizes (each pack contains 2 sponges):
Small (up to 2cm diameter inlet)
Medium (up to 3.5cm diameter inlet)