au01st;396375 wrote: You need the switch kit to hook a float switch to the SL1 or SL2 module. I have mine come on a few times a day for 10min. Set up a channel as a multi timer to turn the pump on for when you want. Then set up an alarm using the float switch to trip (figure out if the switch trips to 0.0 or 1.0 when it's UP) with a set point at 0.5 and use above or below to trip it. If your float switch reads 1 when up, you'll want to trip above 0.5, and if it reads 0 when up, you set to trip below 0.5.
Go back to the output setup and select the alarm you set up and tell it to turn the device off. This setup will turn on your pump and put in fresh RO/DI until the float raises and trips the switch, turning the pump off. Keep in mind if you are using a low power pump it will need to be on channel 1 or 4.