Yes. I do exactly that. On my old ro/di I installed a solenoid at the output. The solenoid is controlled by a timer (apex) and only allowed to run for 20% longer than required for the task it preforms. On my new ro/di (vertex) it requires power to operate. Same idea here. I connected the power to my controller and only allow it to operate for a predertmined amount of time.
Both units are always connected to the water source and I have never had even the slightest hint of a problem. Nor am I concerned about it.
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