ok, so we all know the limitations of SteriPEN, the major one being that it's weak against murky/cloudy water. so assuming you've conceded to the fact, for the purposes of treating "clear" water, this is a great companion to the SteriPEN. Because most "clear" water source in nature will have some visual sediments that you'd rather not consume. The FitsAll does exactly that of removing those visible "ants." But don't go thinking that this will solve the issue of turbid water. One thing to note when using this is to ensure you're pouring around the push tab (also make sure the push tab is pulled open) and not through the hole/opening of the push tab as the water that goes through it won't get filtered through the filter screen.
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