How do you prevent the saltwater from flowing back into the freshwater barrel?
Anyways, this is my RO/DI station.
I need a booster pump, so the tubing is a lot more messy than I would like...
It’s fully automated.
When the RO/DI barrel upstairs reports a low level to the APEX, first the main water solenoid (large, bottom solenoid) opens, and the bypass solenoids actuate (sort of hidden behind the top of the RO/DI unit). Instead of using a 3-way actuator which I don’t have much experience with, the DI line is energize to close and the waste line is energize to open. This directs all RO/DI output to waste (black lines)
5 seconds later, the booster pump starts.
After 5 minutes, the bypass actuators de-energize, sending output to the DI barrel upstairs (white lines). Another minute later, the TDS controller (green box, top left) is powered on. This is set to send a signal to the APEX of the TDS if the DI water is higher than a set point, which stops the whole process and sends a warning. I have to manually reset the APEX to allow further water to be made.
When the RO/DI barrel upstairs reaches a high level, it also shuts down the whole process, but the process can start again when more water is called for.
Except for needing to manually change the DI resin cartridge upon high TDS output, the system will generate batch after batch of RO/DI water until the DI cartridge is exhausted (usually about once a month).
So I guess I did something different than a mixing station,
Matt