Doulton are good too, Super Sterasyl and the Imperial Sterasyl.
They look alike, both brands made in UK, might be made by the same folks for all I know.
Biological filter with Sand, gravel and activated charcoal bucket setups made from 5 gal. Or 55 gal. Should be adequate to filter pool water for laundry, washing and irrigation.
Anyone with suggestions, please chime in.
Water is important! Duhh!
I have a Big Berkey and two syphon Katadyns for backup. The Big Berkey is a purifier as opposed to a filter.