RO/DI problems

I get between 2 and 4. 0 is not needed, but some like to start at 0.
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I don't know where you live in SD (in town or on a well) but I live in the country, the best thing that I have bought is a booster pump for my RO unit. most require 65psi. Even if I moved to town I would have one,alot less water waste (which means less cost) I am needing to change my filters out they have been in for a 1.5 years and still reading 0-1 TDS I run a WATTS CDP6800 Got it from a club member will never be with out one I hope that helps

 

Get your pressure up to at least 60 psi.

 

I agree with getting a booster pump for more pressure. What's the TDS coming out of the membrane?

 

If he has city water he should have over 60psi. I am on a well.
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I get 50psi and i run 100gpd membrane with 0ppm just fine. No booster pump needed. It just might need run for a bit. It never reads 0 after changing filters etc. Usually needs a breakin.

 

I am on city water as well and I only have 50psi. When the unit starts up the TDS climbs after the membrane but after flushing it with the bypass valve for about 30 seconds they come back to around 1 - 2 ppm. I have the color changing DI resin and the TDS is 0 coming from there. If you are getting a significant amount of TDS after the DI resin there is something else going on. I am wondering if your TDS meter needs calibratiing or is it being used properly.

 

Wow you all have very low psi for city water. You guys may have pressure valves on your house restricting the psi down. Average city water pressure is 60 to 85psi from research I did after building my new house. Temp of incoming water can lower output of R/O, but using DI resin and your still getting TDS I would consult a R/O expert maybe.
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I would suspect eIther theTDS meter could be off a couple points or perhaps the gasket on the refillable DI cartridge isn't sealing properly. If you ever drive through Sioux City, I have a spare TDS meter and DI cartride that you could borrow.
Also, are you measuring TDS right out of the DI cartridge or water that is in the barrel? Water in the barrel may pick up TDS as CO2 dissolves in it over time and that should be OK.

 

Have you contacted BRS to see what they have to say about the 1-2 readings when your DI resin has not been exhausted?

 

DI resin will remove CO2 but CO2 will begin to dissolve back into the water when it is exposed to air. Agitation at the air/water interface will speed up the process. (I'm sorry for going off topic here) I doubt the concentration of CO2 would amount to enough to affect algae growth significany, especially after mixing in salt and considering circulation within the aquarium. The relationship between CO2 and algae is interesting, and is worth its own thread.