It seems like this may not be the best idea.
I did not plan on just using two pumps on timers but rather use the apex controller to coordinate various float switches, pumps and monitors.
I would have the NSW water bucket running with a pump for circulation and a heater and heater probe to sync the temp with the DT. At a specific time my apex would shut down my ato outlet and tun on the pump in the sump until a low water level float switch was activated. I would also include a timed shut off that was only a few seconds longer that the time needed to pump out the osw and possibly a back up low float switch. Then after waiting a few moments a pump in the nsw would activate and fill the sump up to the best water level line in my tank which would be the same as the ato switch height. I would also use a back up timer that ran a few seconds longer in case the switch were to fail and also include a back up float switch. After the switch was tripped my ato would be turned back on again.
The system would only be changing maybe a 1/2 gallon per day and I could possibly use a salinity probe in the tank to monitor any possible salinity shifts to stop the process or set off alarms.
I have seen the Genesis water change system and it looks nice but don't see how it is less prone to failure and seems to make you change at least on gallon at a time.
Thanks for your responses.
Maybe this might not be a good idea but I have seen a few examples of system like this on the internet.
Do you all still think it would be a bad idea?
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