I have the 2 koralias, and they are set on timers that I bought from Ikea for 6 bucks for a 2 pack.
Works great, I have the koralias going on and off along with some crappy pumps. I havent had any problems with them yet.
Time interval between on and off is 5 mins on, 15 mins off.
I stopped it though, because the clicking sound started to annoy me.
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