Pool owner sometimes find that their fill water is putting iron into the pool water. Especially when the fill water is coming from a well. Iron accumulates in pool water and iron levels over 0.3 ppm can cause staining.
Many garden hose water filters for hoses have a flow rate of 2 gpm. One member put together two Pentek 150237 #10 Big Blue Filter Housing in series with a PentekWPX5BB97P 5 micron filter followed by a Pentek WP-5BB97P 0.5 micron filter with a flow rate of 10 gpm for his fill water.[1]
They screw on the end of a garden hose before the water goes into the pool. After filling the pool the filters are removed and dried in the sun to avoid any kind of mildew growth from wetness.
