User Review: MSR SweetWater Microfilter

I had used this filter for about three years after switching from a Hiker. It is fast, but as the filter starts to retain debris, the pumping becomes slower and the relief valve opens frequently. The add-on prefilter helps with this.

My big issue is the quality of the pumping mechanism. I had two filter's stems break off just above the pump mechanism in one week. I was using one personally and it was not a filter clogging issue. I'll switch over to the Guide to give that a try.