Matthias

what Mattrees is trying to achieve is basic water change but he has found a common hurdle.

The biggest hurdle faced is the fact AWC can not be performed accurately until the sump level has stabilized from water draining back from the tank to the sump when the return pump is off, so there needs to be a "timed wait" function built in so the AWC does not start draining sump water before the tank water has not yet fully drained back down.

Mattrees - the delay on for the skimmer is not too hard just use programmable logic using delay on function.