ro/di question

[stuccodude]

good morning you'all does anyone leave their ro/di system hooked up and on a float valve to turn it on, is this something that could be done instead of turning the water on this would be nice to have the water always full, thank you

 

[ryeguyy84]

I kinda do, I leave the water on and have a solenoid valve turn it on twice a week to fill the container. The float valve stops the flow but I run it like this so it's not filling as it's used. Running the unit longer saves di resin.

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[laverda]

You can, but but it is not the best way to run a RO/DI. When you first turn on any RO/DI the TDS coming out of the membrane will be high, then gradually dropping to a steady low number which your DI then drops to zero. The way you are running yours you will exhaust you DI much quicker.
You did not say but I assume you have it going to your ATO container. A potential problem is if you ATO filled any time it runs low, it could allow your ATO to add too much fresh water if the ATO stuck on or you had a leak or spill. Ryeguy’s method is much safer and also better for membrane and DI life.

 

[Scrubber_steve]

good morning you'all does anyone leave their ro/di system hooked up and on a float valve to turn it on, is this something that could be done instead of turning the water on this would be nice to have the water always full, thank you

It's actually the way not to do it. Perpetual TDS creep.

 

[stuccodude]

appreciate the feedback

 

[Kevin Guthrie]

I have a float shutoff valve on my RO/DI reservoir. When the reservoir is full it cuts the water going into the RO/DI. It's been problem free for 25+ years. I manually refill the topoff reservoir with water from the RO/DI reservoir once a day.

 

[laverda]

I have a float shutoff valve on my RO/DI reservoir. When the reservoir is full it cuts the water going into the RO/DI. It's been problem free for 25+ years. I manually refill the topoff reservoir with water from the RO/DI reservoir once a day.

Your set up is much better then what I thing the OP was planning to do. You are not filling you ATO directly, so you have isolated your tank from your RO/DI. In addition your RO/DI only turns on once day for that reason. When the RO/DI reservoir is the same as the ATO reservoir your RO/DI May turn on 10-30 times a day depending on the size of your return chamber and evaporation rate. That produces water much higher in TDS, especially if it only comes on for 30 seconds at a time. It takes longer that 30 seconds for the TDS coming out of the membrane to get to its optimum. I know my ATO comes on every hour on my tank most hot days. I only run my RO/DI once or twice a month.

 

[hkgar]

I have a float shutoff valve on my RO/DI reservoir. When the reservoir is full it cuts the water going into the RO/DI. It's been problem free for 25+ years. I manually refill the topoff reservoir with water from the RO/DI reservoir once a day.

Basically what I do. I fill a 52 gallon brute and have a solenoid switch to shut off the RO/DI booster pump. I use that to fill two 32 gallon brutes (1 for ATO and 1 AWC) from drains on the bottom of the 52 gallon. Those drains are controlled by manual in line shut of valves.