I have a AquaHub ATO kit. It is just a float with a snail guard and a second float to turn the pump off in case the first one fails. It runs to a relay that I have a Maxijet 400 plugged in to. I have a JBJ ATO on my big tank and this $40 DIY kit blows it away with reliability and accuracy. Everything you would need except an extension cord and pump come with the kit. It took me about 20 min to build it up.