Water purification

all you guys using steripen must have large bodies of water that arent dirty ?
Why do you say that? I use mine drinking out of creeks, cliff seeps, rivers, ponds, even drank out of a nasty stagnant stock pond once (needed Gatorade powder to mask the taste) and all turn out just fine for me.
 
Sawyer mini and MSR hyperflow have worked well for me. I have owned 3 Katadyn pump filters and all have failed.
 
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