Why is my SweetWater Microfilter becoming more and more difficult to pump?
The more that you have used the filter, the slower you will be able to pump water. Also, it is normal that, with use, the flow rate will slow from its initial rate of 1+ liters per minute. With these points in mind, when pump resistance grows, first clean the filter, then back flush the SiltStopper (if included). Make sure that the bottle adapter air hole is clear, and confirm that the hoses are not kinked. If these actions do not lessen resistance (especially the cleaning), then it’s most likely time to replace the filter.
