[Tangman]

I have a pre-sump that holds about 30 gallons, with a by pass .
To do a water change I open the by pass , open the drain at the bottom of the pre-sump , once emptied, close the drain, refill via ro/di water on a kent float valve, once full, add salt, mixing pump, heater and let mix for 24 hours, test, and close by-pass and I'm done!
Takes about 25 hours with NO effort