"Very solid" - Review of Katadyn Pocket Water Microfilter

The Katadyn Pocket filter is very solid and I'm confident it will give me years of good use (probably a lifetime). After about 50 liters it became quite hard to pump, even though the water seemed pretty low in sediment. This was a noticeably sooner than other filters I've used (especially the far-cheaper PUR Hiker). Also, the filter does not appear to have all the parts described in the directions (notably the cleaning brush --- only brillo-type pads were included). I fear that the absence of the brush may have led me to clean slightly more aggressively than is optimal, scratching the ceramic element in a few places.
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