JUWEL Filtermedia! Made to fit each Filter System! Use the filter baskets for your filter system to make maintenance even easier! The coarse and the fine blue filter sponges house the most important bio - cultures, which are responsible to effectively clean the water. You should clean or replace one sponge at a time every 3 - 6 months to maintain the right biological balance in your aquarium. Filter Sponges Compact Coarse Measurements: 9.9 x 9.9 x 4.8 cm Manufacturers code: 88050 Filter Sponges Standard Coarse Measurements: 12.5 x 12.5 x 5 cm Manufacturers code: 88100 Filter Sponges Jumbo Coarse Measurements: 14.8 x 14.8 x 5 cm Manufacturers code: 88150
