The Juwel Aquarium Coarse Blue Filter Sponges house the most important bio - cultures, which are responsible to effectively clean the water.

It is recommended to clean or replace the Juwel Aquarium Fine Blue Filter Sponges at least 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.

Filter Sponges Jumbo Coarse measurements: 14.8 x 14.8 x 5 cm