[Tom Gower]

My Tds is sky rocketing and I have no idea why. About 200 litres ago I changed all filters and DI Resin and got a reading of 000. This morning when I turned the machine on I had a reading of 001, I then checked again after an hour and it was reading 002, 3 hours later 007. It is an RO-MAN and filters and DI were purchased from RO-MAN also. I flush the system regularly.

Could the membranes have had it? or could there be someother reason?

I have calibrated and tested the tds metre.

[GWCS]

please tell us what spec your equipment is..

sizes etc.

what is your tds before ro what is it after ro/before di

what was it before you had these problems?

[Tom Gower]

it is an ro-man 300gpd

Tap water 301ppm
The DI is built into machine, my water has always come out at 000 before. It did rise to 004 before I changed the filters and DI resin then back to 000. I made only about 200 litres then went on holiday for two weeks then this problem occured.

[GWCS]

what is the tds reading out of the ro before di?

Likely that the ro out is too much tds for the polishing di you have. You'll probably need a bigger di cannister.

[Tom Gower]

what is the tds reading out of the ro before di?

Likely that the ro out is too much tds for the polishing di you have. You'll probably need a bigger di cannister.

Just checked and it is 216ppm

[GWCS]

301 tap tds and 216 tds ro out?

[Tom Gower]

yes have never checked before and was so surpised checked 3 times

[GWCS]

sounds like a membrane issue..

what is your tap pressure?

[Tom Gower]

90 psi with booster pump

[GWCS]

that high! LOL what psi rating are your membranes?

[Tom Gower]

that high! LOL what psi rating are your membranes?

3x membranes were told that they were 100psi, although brought secondhand and have no instructions

[GWCS]

that high! LOL what psi rating are your membranes?

3x membranes were told that they were 100psi, although brought secondhand and have no instructions

I think thats your answer.

Any second hand is dodgy you cannot guarantee what went on before hand. You have no instructions so cant be sure of the rating (unless its printed on them)..

I reckon the membrane/s have gone..

see what some others say when they come online..

[Tom Gower]

just opened and membrane says 65psi but is that so bad when divided by three?

[GWCS]

just opened and membrane says 65psi but is that so bad when divided by three?

Im not sure, but i think it goes from one to the other then to the other then to the other, so the first membrane gets the most psi in which case the first membrane has likely been shot to death..

phone ro man direct and try and ask them.

[Tom Gower]

just opened and membrane says 65psi but is that so bad when divided by three?

Im not sure, but i think it goes from one to the other then to the other then to the other, so the first membrane gets the most psi in which case the first membrane has likely been shot to death..

phone ro man direct and try and ask them.


Thanks I will try that, is there any way to test membranes?

[John Walker]

just opened and membrane says 65psi but is that so bad when divided by three?

Im not sure, but i think it goes from one to the other then to the other then to the other, so the first membrane gets the most psi in which case the first membrane has likely been shot to death..

phone ro man direct and try and ask them.


Thanks I will try that, is there any way to test membranes?

Try bypassing the first membrane and then check the reading.