or 100 gallon per day (GPD) RO membrane with the best 98-99

The one expendable part of this system is the germicidal UV lamp can be easily changed with out any disassembly of the unit

Mixed Bed resin is what you want if you want ZERO TDS

Dimensions and Weight : 10" x 1

Saltwater Aquarium Anti TDS Storage Tank for SMART Evaporation Top Off Automation

ANION DI Resin Color Changing Bulk Media PREFILTER or 100 gallon per dayANION DI Resin Bulk Media Color Changing Nuclear Grade Single Bed ANION Resin Professionally packed in a a heavy duty 5 mil Mylar bag with a very nice Ziplock seal the same day you order. (one 5# bag is more than enough for 4 x standard 10" refills) The Anion di resin media color changes from blue to amber as the resin exhausts. This helps you to visually keep track of the quality of your water. Media bags are packed the same day they ship to