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Package Include: 3 x coarse foam(black), 3 x medium foam(white), 3 x fine foam(blue). Foam size: 17 inch x 11 inch. Simply cut holes in the desired position with scissors to fit most filter boxes. Egg-crate profile on one side to effectively catch waste from the water. Cleans pond water of suspended debris, keeping efficient water flow with less clogging for long lasting filtration. Provides a breeding ground for beneficial bacteria, aiding biological filtration.