aquasafe ro unit high tds

hhabss · #1 03-06-2010, 09:50 PM

i set up a new aquasafe ro/di unit two days ago and the tds is still at 200ppm. is there a break in period or is it possible the ro membrane could be faulty ?

ABreefkpr · #2 03-06-2010, 10:02 PM

Can you post pics. What is TDS of the water going in to unit?

hhabss · #3 03-06-2010, 10:45 PM

i cant post pics right now. the tds going in is +/_ 200 ppm. i triple checked the hook ups from the instructions so i think im good there.

ABreefkpr · #4 03-06-2010, 10:59 PM

I have the aquasafe ro/di unit. My well water is at about 420 ppm, unit strips to about 10 ppm. Do you have the auto shut-off and flush valve?
You might have a faulty membrane. Mine was working right off the start. When I was on town water at approx. 185 ppm unit stripped to about 2ppm.

mark · #5 03-06-2010, 11:14 PM

what the TDS is after the unit (before the di) is the important number.

With the reject rates of membranes being 90-99% depending on type, the output should be at least 20.

Delphinus · #6 03-06-2010, 11:15 PM

I would suspect membrane. It should be bringing the TDS down to <10 within a couple minutes. That said, how long are you waiting? At startup there is typically a "TDS surge" which can last anywhere from 5-10 minutes. Usually what I do is flush the membrane for a good 5 minutes and then check the TDS. If it's still 200ish after 5-10 minutes though, then the membrane is toast.

mark · #7 03-06-2010, 11:19 PM

is the output on the connector with the check valve? how is the flush valve positioned (should be 90° to the line)?.

hhabss · #8 03-06-2010, 11:28 PM

i do have the flush valve. the instructions said to adjust to 3:1 discharge to good water. it must be the membrane shot. i will phone them on monday to see whats up. thanks alot.