Hagen

Your Pre- filter of your G Series Filter will need scrubbing every day or two in the first few months, as it is conditioning your water and trapping all suspended waste before they have chance to turn into Nitrates and Phosphates. I only have to exchange or clean our pre-filters around once a week now, when the flow drops by around 25 to 30%.

When the pre-filter is cleaned the flow should return to 100%, please make sure you thoroughly scrub the pre-filter cartridge by popping off the base so you can push the brush all the way through.

I have found out through experience that by having 2 pre-filters and letting one dry before scrubbing, the 100% the fine debris is removed. The pre-filters are polishing the water and trapping suspended debris that no other filters will.

Please also make sure that your pipes are not squashed or kinked.