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Product Details
✓All four stages with the membrane included: one sediment cartridge, one carbon block, one color indicating DI cartridge and a 100 GPD RO membrane. This is the complete refresh, the one to buy when the membrane is due at the same time as everything else rather than for a routine prefilter change. If only the front stages are due, the smaller sets on this page cost considerably less.
✓Each stage does a distinct job and they run in order. Sediment captures sand, silt and rust. Carbon reduces chlorine taste and odor, and protects the membrane behind it, because chlorine attacks the thin film composite material a membrane is made from and is what shortens its life fastest. The 100 GPD membrane reduces total dissolved solids under line pressure, and the DI resin polishes off whatever remains.
✓The membrane is rated at 100 gallons per day, so a storage tank refills faster and a top-off reservoir fills in less time than it would on a slower element. It is the standard 1812 size used in most slim line RODI systems. One thing to check before fitting: make sure your drain line flow restrictor is sized to match, because a restrictor meant for a 50 GPD membrane will hold the output back and you will not see the benefit.
✓The DI cartridge is filled with Resintech MBD-30 nuclear grade mixed bed resin, which changes color as it exhausts. That means you can see when it is spent rather than guessing or waiting for a TDS meter to climb, which matters because DI life depends entirely on how much dissolved solids your source water carries and varies enormously between households.
✓The stages do not wear at the same rate, so knowing which is due saves buying parts you do not need. Sediment and carbon change about every six months; the membrane runs one to two years; the DI cartridge changes when its color turns. Falling flow at the outlet points at the prefilters, while a rising TDS reading points at the membrane or spent resin. Fits RO Buddie class and standard 10 by 2.5 inch systems. Compatible replacement made by CFS, not an original manufacturer part.