Title: Whaty the heck.
Review: I followed the instructions as the instructions said.Thick blue stuff came out of the tube when I was cleaning it. I tested the water for particled before and after . The reading was higher AFTER I had cleaned it and ran tap water through it. It was really slow to filter and did not perform to my expectations. I'll not use this and it will be in my junc to get rid of pile. Buy a Sawyer filter and you won't worry about having to replace the expensive filter this thing has. I would have returned this thing but I didn't test it before the return period was over.
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