Another question for the RO pros!
by, 04-24-2012 at 02:19 AM (1619 Views)
My incoming TDS is high. Extremely high. 750+ high. That being said my 4-stage does a very good job of getting it down. Usually averaging less than 30, sometimes 20. Well below the 5% accepted return. That's great for drinking water, but 20-30 TDS entering my DI is literally just exhausted a 10" BRS "Nuclear Grade" resin refill within 200 gallons. I am running this filter array:
5 Micron Purtrex sediment filter5 Micron Matrikx+CTO/2
1 Micron Matrikx+1 Carbon Block
150GPD/98% rejection membrane
Ran out to a BRS stand alone DI canister. TDS reads zero out of the DI. My R/O feeds my refrigerator and tees off to the DI. I bleed off the R/O until TDS is down to the lower limit before opening the valve to the DI each time I run a batch, usually 30-50 gallons at a time.
My plan is to add a few large sediment filters in front of the R/O unit. I was thinking 2- 20" canisters, the first with a 10 micron sediment, the second with a 5 micron sediment. If I did so, would you recommend replacing the sediment filter in my R/O with another carbon block? Maybe go 5 mcn carbon- 1 mcn carbon- 0.6 mcn carbon then membrane? Or do I need to add another membrane?