RO/DI unit troubles

[mike31154]

Sorry to hear about all the troubles.

Sometimes the flow restrictor is integrated into the elbow fitting at the output of the RO membrane housing... I think. Hard to imagine they would sell you a system without a flow restrictor. Make sure this is not the case with your system, 'cause if it is, you may now have two flow restrictors. That could explain the trickle scenario. My 5 stage 75 gpd system produces slightly more than a trickle with the input pressure at close to 60 psi after the pre filters. A 100 gpd membrane should obviously produce more than a 75. Are you sure you need 7 stages? Might work more efficiently with fewer stages. What's the configuration, i.e., how many pre filters, carbon filters etc.?