| The Juwel blue filter sponge house the most important bio - cultures, which are responsible to effectively clean the aquarium water. You should clean or replace one sponge at a time every 3 - 6 months to maintain the right biological balance in your aquarium. The Juwel Blue Filter Sponge is suitable for the internal filters Standard and Standard H, the sponge is available in rough and fine. |
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Juwel Blue Filter Sponge for Standard