A 1-micron prefilter has such small pores that it would need to be changed every month unless you install larger micron prefilters before it. Otherwise it can quickly clog up and diminish your water flow. Plus, if too much water pressure backs up because it is clogged, it could crack the housing. Typically, a 1-micron prefilter is only recommend to remove asbestos or other harmful small particle substances.
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