How often should you wash out the filter sponges?
The sponges in your internal and external filter are available with fine and coarse pore sizes. They mechanically retain particles such as food remains, faeces, leaves and algae. The bacteria which settle there decompose the substances retained. This means that the filter performance will decrease in time. You can rinse your JBL CRISTALPROFI filter sponges up to twice under lukewarm water (25 °C). Please do not wash too thoroughly, as this will cause the important cleansing bacteria to die off and be lost. The sponges should be replaced after approx. 2 months. When you rinse them, you will find spots where you cannot remove the dirt. This indicates it is time to replace them.