The replacement foam set for the Swell Bio Pressure Filter Deluxe means that you can change the sponges within this unit, both the black and yellow sponges, and keep your filter functioning at its very best. Sponges will build up with dirt over time, and although regular maintenance will help to prolong their life, they will need replacing periodically, ideally once a year or so. These sponges come as a complete set and will fit perfectly with the Bio Pressure Filter, meaning your water will be kept in its very best condition.
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