The water in my house comes from a well. Fine sludge is always present in the water flow. I used an AP110 filter to remove silt. KAROFI Whole House Water Filter Replacement Cartridge is a reasonable replacement for AP110. Both filters are 5 microns in size. I compared the flow rates for the two filter types and calculated the time to fill a two liter container. The AP110 was about four percent faster, meaning the AP110's flow rate was faster. I attribute this to the deep grooves in the AP110, which effectively double the surface area. I've come to the conclusion that the Karofi filter isn't that good, but is a reasonable replacement.
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