My rodi reservoir is 35 gallons, this is also my ATO reservoir, I turn off my ATO, add my salt, and left the powerhead that's on it there 24/7 mix it up, I have a heater in the 35 gallon reservoir any way, so after a hour or 2 when the water is clear again, I turn on the ATO again and pump out from my sump, this activates the ATO pump and fills my tank with clean salt water.