in cold water. Mixing the water as in an expanse of open water would dilute the critters.
Stagnant warm water is a primo happy site for the beasties.
Most non filterers dip from the middle of the lake where Nature gives a bit of her own SteriPen treatment.
A boggy quiet area..well animals do poop there too. Humans sometimes too and they are the prime vector for giardia.
Didn't look up crypto.
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