ro/di ?

[cc90g]

what should tds be after ro and before di

 

[aquainas]

It should be ~ 1 before your DI cartridge.

 

[sailoracu2]

I just check my ro and it was 9 and the Di was 00. My filters are 6 months old.

 

[cc90g]

i have a new 6 stage ro/di tds for my city water is 260 coming out of ro 20 and di is 0

 

[GROWSZOAS]

how old are the pre filters

 

[shawnz28]

it should be about 3% of the tap. You can figure most membranes are rated to 96% or better rejection. Lets say they average 3. If you tap is 200 your RO should be 6 better is all is working.

 

[cc90g]

pre filters are new

 

[shawnz28]

<a href=showthread.php?s=&postid=15273862#post15273862 target=_blank>Originally posted</a> by shawnz28
it should be about 3% of the tap. You can figure most membranes are rated to 96% or better rejection. Lets say they average 3. If you tap is 200 your RO should be 6 better is all is working.

The above should have read "6 or better". I would expect your TDS to be about 6 to 8 after the membrane if 220 going in.

 

[Buckeye Hydro]

Shawn has it right. First check the factory rated rejection rate of your membrane, and then calculate your actual rejection rate. So your RO water should be x% of your tap water tds reading.

What membrane are you using?
What is your tap water TDS?
What is your RO water TDS?

Russ