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.

Suitable for RIO 300, RIO 400, TRIGON 350

You may also want to consider the other Juwel Jumbo Sponges in the related products below.