fishpimp69
Premium Member
I changed all my filters on my ro unit and its still producing a tds reading of 28. Do TDS meters need to be recalibrated?, could having my ro unit outdoors be causing this? What are some other possibilities?
Whats up with my RO
- Thread starter fishpimp69
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fishpimp69
Premium Member
anyone?
vanmo92
New member
Did you change the membreane or just the filters. I'm not sure if you can recalibrate a TDS meter. But i would change the Membrane if you havent recently. If you did change the membrane and the filters latly i would get a new TDS meter, maby the one you have is giving false readings.
AZDesertRat
In Memoriam
Changing pre and carbons has very little effect if any on final TDS. The name itself should give you an indicatiom, TDS = total dissolved solids. Pre filters trap suspended or large solids and granular carbons only remove chlorine and volatiles like benzene and toluene. Carbon blocks do help with suspendeds.
The membrane is the workhorse of the system and takes care of the dissolved solids.
Yes you need to check your TDS meter against some known good DI or distilled water. Then using a very clean glass check your Tap water, triple rinse with DI, check your RO only, again triple rinse and finally check you RO/DI. Having all those numbers will tell you where your problem lies. A good RO membrane should be rejecting 98% of the tap water TDS, if not you have a bad membrane or a 90% rejection rate nano filter or both.
DI will only last a certain amount of TDS and if you have 28 going in thats not very long. 16 oz of resin will take care of approx. 3000 total TDS so you can figure that one out.
The membrane is the workhorse of the system and takes care of the dissolved solids.
Yes you need to check your TDS meter against some known good DI or distilled water. Then using a very clean glass check your Tap water, triple rinse with DI, check your RO only, again triple rinse and finally check you RO/DI. Having all those numbers will tell you where your problem lies. A good RO membrane should be rejecting 98% of the tap water TDS, if not you have a bad membrane or a 90% rejection rate nano filter or both.
DI will only last a certain amount of TDS and if you have 28 going in thats not very long. 16 oz of resin will take care of approx. 3000 total TDS so you can figure that one out.
fishpimp69
Premium Member
i have a aquasafe unit, and I did change the membrane. It does have some little filter on top that says something about taste, but when i first bought the unit it would read 00 on the tds meter. I also did a check and the tds meter worked on other distilled water. There might be algea in the drain tube out of the unit could this cause it?
AZDesertRat
In Memoriam
Toss the final little carbon filter or hook it up for RO only drinking water, do not use it after DI or you will be adding TDS back in the form of carbon dust.
fishpimp69
Premium Member
cool thanks
robsmith32
New member
what is the tds of the tap source water??
I've had chlorine ruin a few membranes, and have to find why it is getting thru the carbon prefilters, before i trash another membrane.
If tds is that high, i'm pretty sure the membrane is needing replacing. But like azdesertrat stated, don't have the cocunut carbon after the di. you can put a tee if coming off the membrane that one goes to the cocunut carbon and the other going to your di.
I've had chlorine ruin a few membranes, and have to find why it is getting thru the carbon prefilters, before i trash another membrane.
If tds is that high, i'm pretty sure the membrane is needing replacing. But like azdesertrat stated, don't have the cocunut carbon after the di. you can put a tee if coming off the membrane that one goes to the cocunut carbon and the other going to your di.
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