27,000 gallons of central CA well water housed in a fiberglass coated concrete/plaster pool, dug into the most productive top soil on earth and surrounded by an urban forest. Cleaned with a Pentair SuperFlo VS pump, a 48 sq ft DE filter, CP RJ60+ SWCG and a Dolphin Discovery (S200) robot. 250 gal Hot Springs Solana RX stand alone spa. Taylor K-2006 and K-1766. My first thread... New Old House, New Old Pool....