The one on RC simply had two Tunze ATO systems plugged into a Neptune controller. If the tanks pH became to high it would shut off the one running through a kalk reactor and run the one that just pumped clean RO/DI water. Any Neptune controller could do that easy.
The program could look like this:
If pH > 08.50 Then AT1 OFF
If pH < 08.50 Then AT1 ON
If pH > 08.50 Then AT2 ON
If pH < 08.50 Then AT2 OFF
Last edited by whatcaneyedo; 02-15-2010 at 12:46 AM.
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