SpectraPure CSPDI-90-MF CSP RO/DI System with Manual Flush, 90 GPD 2:1 waste to product ratio produces 50% less waste water on soft water Spectra select plus 90GPD individually tested ultra high (99%) rejection thin-film composite Manual membrane flush valve for extended membrane life and performance Superdi silica buster high-capacity di cartridge with custom blended ultra pure deionization resins Three probe inline TDS meter monitors membrane feed water, membrane product water, etc.