I have a 150 gpd unit from BRS. My usage of membranes and DI resin are excessive at least according to the recommendations I have seen. Also my TDS from the RO unit to the DI unit seems high, currently 25, I believe they should be in single digits. The membranes were changed in Jan, they had lasted 5 months, my reading were even higher than 25, the sediment filter in March and the carbons in Feb. I typically change the sediment filter each month and the carbons every two months. The DI resin is expired in 30 days. I changed it when the TDS reads 2 on the output. I am on well water here in Elizabeth and have a whole house filter system consisting of 2 sediment filters changed each month and 1 carbon filter 20" changed every 2 months. Recently I checked the TDS at the kitchen and got 168 which I thought was pretty good. This would be water going thru the whole house filters and also feeds the RODI unit. I don't know my water pressure but believe that is high or at least normal considering the force it comes out of the faucet. My think is that if I could get the TDS down going to the DI resin that would solve the high resin use. My other thought is to slow down the flow from the main to the RO unit with a restrictor to say 50 gpd or replace the current restrictor in the lines to the membranes to something like 50 gpd. Anyone else had this problem and have a solution ?