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+1 downbeach. I'm using a water blaster 3000 and it's very efficient. Dan you should look into RO DCS controllable pumps. The DCS 5500 should work for you. I have a bunch of Carib seaflor special if you're interested in making the trip out. I could also bring it to Hamilton nj sometime this week.
Even when you have zero TDS you still can have other pollutants in the water that don't show a reading. There wasn't much work done. I had an old 3 stage RODI that was sitting in my garage. I trust my friends judgement and his tank doesn't lie.
i can't take all the credit. my buddy gave me the idea. i added a 2 stage pre scrubber straight off the pipe before the booster pump. it consists of a sediment filter and a carbon block. i also added an additional di resin at the end.
red comes straight off the pipe into pre scrubber then to...
i believe you answered you're own question! are you using any phosphate remover? i recently added 3 additional stages to my rodi and now run 8 stages. my corals love it.