Which reef keeper do you have? What I want is like this:
1 water level gets low controller sayd ok we need water, but first let me open this switch for 5 minutes (open valve to flush ro
membrane) then close it, after that open this switch (ro
output to fill tank/sump/whatever), ok tank/sump if full enough now close all switches.
Also to control lights and ph and also test water parameters, and what parameters can they reliably test for? Calcium, ph, salinity, phosphate, the big 3 (ammonia, nitrite, nitrate)? Can they do all these?