A simplified description.
2 separate little systems.2 pumps,2 timers
System 1-pump one does double duty.Mixes up a months worth of SW.Turn a valve now same pump will transfer a set amount to sump controlled by a simple digital timer.
System 2-pump two(aqualifter)sits by sump and SLOWLY sucks out set amount and is discharged to house drain.I timed how long this takes and set timer two accordingly.
I have the suction tube set a normal sump level,so it will suck air at this point and level will not go down past that point.
Thats pretty much it.Has worked flawlessly for several years.
I also built in to it an overfill cut off,and an indicator SW reservoir empty
No pics,nothing really to see.