Completely Automated ATO/RO

[elliot_visco]

Good Afternoon:

I am hoping to start a conversation to see if anyone has a completely automated ATO system. I am going to be setting a new tank soon and I would like to eliminate the step of manually filling up a bucket with R/O. I have considered the idea of using quarter inch electronic solenoid valve that would be kicked on using a JBJ ATO. That would open the water supply to the RO unit that would therefore fill my reservoir. Does anyone have a automated ATO like this?

Any suggestions or comments would be welcome.

 

[azjohnny]

You would want to put float valves in the container the RO/DI will be drawing from( I suggest the container being at least 30 gals) The float valves will signal the RO/DI to make more water

You don't want the ATO controlling the RO/DI for 2 reasons

1. If the valves fail it will continue to run and over fill the DT lowering the SG and making a big mess on the floor

2. The RO/DI will only be making 1-2 gallons of water at a time which will cause the membrane to prematurely foul and to burn through DI due to TDS creep

 

[frogg21]

I ran my rodi directly off the ATO floats. Wire two floats in series for redundancy in case one sticks. As was said, if they both fail, you got a flood. I ended up switching to the way everyone else does (dedicated RODI holding tank with its own float) because of the TDS creep issue.
Consider it the #1 automation to make your tank enjoyable!

 

[mikluha]

I use two float sensors for each sump and holding tank - "low" and "high". They have about 2 inches height difference.
Valve is opened when water level is below "low" sensor and closes if water level is above "high" sensor. This prevents from constant "on/off" oscillations due to waves in sump/holding tank. And simple plastic float valve (eBay) is used for redundancy

 

[flananuts]

My RO system had a 4 gallon drinking container so I have pressure. I use two 12v solenoid valves plus a small gate to add top off directly to my sump. The fail safe solenoid is open until the float closes it. The one that actually provides topoff is the opposite. I run a TDS meter and a separate BRS DI filter with clear container so I can see the resin changing colors. I have a reefer 170 and I change the DI every 6 months which is when I start to get TDS above 0. It's the best ATO setup I've ever built.


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