We used a Katadyn Vario filter during our last hike in Scotland. It uses a ceramic filter when used in LONGER LIFE modus.
The waters in Scotland however have a tendency to be brown (due to the peat in the ground I suppose). As a result, the pumping became increasingly difficult. The ceramic filter turned brown.
Katadyn provides you with a cleaning patch for the ceramic filter and it helped a bit, but still, the filter has a brown color and the pumping is less easy as it used to be.
Are there any other tips on how to clean ceramic filters in general? Is there some chemical way to get them cleaned instead of cleaning them with the patch?