JUWEL Filtermedia! Made to fit each Filter System! Use the filter baskets for your filter system to make maintenance even easier! The coarse & 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. Please observe the maintenance guidelines in your instruction manual for further details.