Ro water

jelly · Jan 4, 2018

I keep my ro water in a storage tank where it will degas and sit until used in top off water or for my mixing barrel. When I filled the tank the water was 3tds. Now that I'm running it into my resin it's 128tds. Dose ro absorb stuff out of the air? My barrel always has a lid on so nothing gets in.. my storage tank is a 100g storage tank and it will sit for a long while before it's all used.

ihavecrabs · Jan 4, 2018

jelly said:
I keep my ro water in a storage tank where it will degas and sit until used in top off water or for my mixing barrel. When I filled the tank the water was 3tds. Now that I'm running it into my resin it's 128tds. Dose ro absorb stuff out of the air? My barrel always has a lid on so nothing gets in.. my storage tank is a 100g storage tank and it will sit for a long while before it's all used.

Any dust that falls into the container will certainly raise TDS. Also containers can leach. I see an increase in TDS in my RO top off containers but have never worried about it. I knew it was 0 going into it so anything harmful from the water source is taken out. Anything that ends up in the RO ends up in my tank too either way (given that I have a rubbermaid stock tank sump and dust falls into the tank too)

Are you using an appropriate container? Are you spraying anything around the container? That would be all I would worry about.

jelly · Jan 4, 2018

It's a good poly tank and nothing is ever sprayed near it. Guess I'll need to get a 3rd tank to degas in the Send it into the resin. The tds now kills the resin so I'll need to fight out a way to do it.

AquaFX-PB · Jan 5, 2018

Have you tested for dissolved O2? 128 TDS is a pretty large jump - sounds like something got into the container.
Off-gassing shouldn't effect TDS (as dissolved gases are not dissolved solids) - Just like "Ihavecrabs" mentioned, you most likely culprits are

1) Something got into the tank, maybe was already even in the tank (like a small chunk of salt) - and dissolved into the new water. Gasses will not show as a TDS on your TDS meter.
2) The tank is 'leaching' into the water. I have had 100's of friends/customers use "non food grade safe" plastic on RO/DI water, and what starts off at 0ppm, can be over 50ppm within a few hours. You're not quite at zero - but 3 ppm is pretty clean water and I would expect the waters behavior to be somewhat aggressive as Zero-TDS water is.

Clean a glass with RO water, rinse with RO water - and then try storing some fresh RO water in that now clean glass - you should find that the TDS does NOT change over any period of time (unless something gets into the glass) Additional off-gassing (like you mention in a 3rd container) wont address this issue.

Let us know what you find!! Happy 2018!!

Myk · Jan 5, 2018

Do you any gear in the tank that might be leaching? Bad heater, mixing pump, etc?

jelly · Jan 5, 2018

Only thing in the water is a dc pump and a piece of pvc pipe

Myk · Jan 5, 2018

I would run the same test as mentioned above. Run some of the water into a glass container as a control and see if there is any TDS after 24hrs. If not run the DC pump in the same container and then retest TDS.

jelly · Jan 5, 2018

The new water I just added the last 8 hours is at 20tds. It God into the take at 3

Myk · Jan 5, 2018

Has to be coming from somewhere. What is the DC pump for? Just for circulation? Other option, just take it out and see what happens.

jelly · Jan 5, 2018

It's to move water between barrels and my ato

Myk · Jan 5, 2018

Is it easily removed?

jelly · Jan 5, 2018

My goal is to basicly get better life out of resin. If I need to redo my to unit go into resin first then I will. Bit wanted house barrel to degas then go into resin