Lake water always has a few little things swimming around in it and it is nice to be able to filter them out of your water. This design lets you convert a bucket into a prefilter using a hottub filter and some M3 ready rod. The resulting water is not drinkable, but it is more pleasant to do your washing and bathing in some water that doesn't have little bugs swimming in it. Or you can use it to prefilter your water before you put it through your more expensive filter that outputs potable water. I have been using this set up for the last 4 years and it is works wonderfully. I am using old food buckets, but a 5 gallon pail would work just as well.
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