Once you get it up and running, and you really understand how it behaves, every 2-3 days would be enough.elenaran said:Here's another one: obviously until I get to know my pool, I'll be testing it all the time, but after I get to know it, and if the weather's been pretty constant, how often do you really need to check? Assuming the SWG is working properly and I've learned what operating level works best under what conditions, wouldn't I be able to trust that it will hold the FC steady for a few days?