The 210419 is an optional add on for the AXEON R1-5140 Reverse Osmosis System. This option upgrades the R1-5140 with the addition of a manifold to allow for the use of a permeate flush feature. Permeate flush takes pure water stored in the permeate tank to rinse the membranes of the concentrate to prolong the lifespan of the membranes.
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