au01st;542728 wrote: So your low float switch kicks on the pump for a predetermined amount of time? Or it turns on til the float trips again and turns off?
I would get a set of floats in series like shown, put the ATO pump on a timer and set the timer for just a bit longer than is needed in case of hot days. For example, set up the float and fill the water until it goes from closed to open on the RK display. Then wait a pre-determined amount of time, easy way to do it is say one day EXACTLY, and turn the pump on til the float opens again (it should have closed as water evaporated and the level in the sump dropped). You can measure the amount of time the pump ran to refill to the "open" level, and divide by 4, 6, or 8 depending on how many times you want to have the ATO kick on. Then add a minute or so to this time and you'll have your "time on" to use for the reefkeeper, and the "repeat:xx" is however many you divided 24 by.
The result is that if the float switches fail, as long as the timer is still working and the pump doesn't stick on, it will take days before an overflow occurs, and you'll likely notice it before it's a problem and a mess.
I hope that explanation made sense, and if you need help, just PM me. Basically just set the pump as a "multi timer" (assuming Digital Aquatics, right?), set a start time at like 12:00:00 am, set "duration" to 5min, "time off" to 3hr, 55min, and repeat to 2. Then set another up again starting at 12:00:00 pm with the same settings. Finally, set an alarm triggered by the float switches (usually set point is .5 and trigger above or below based on orientation of the float, this is easy enough to determine if you sit there and mess with the float) to turn off the alarm.