evoracer

I have an RO unit, 4 stage with a separate DI teed in to allow for non-DI drinking water. I am running a 150 gpd 98% renection membrane. It works very well (750+ tds in, ~20 tds out after RO, zero after DI). The problem is it won't shut off. The ASOV (auto shut-off valve) just pulses, never actually cuts off the brine water flow. I checked and rechecked the installation, using Melevsreef.com's troubleshooting guide. I replaced the ASOV, no help. However it did change. The original did nothing ...