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Originally Posted by Chad
I use the Milwaukee SM122 myself. Its a PH controller. I use it for Kalk as well.. I modified the unit a bit so it has a closed circuit when the PH falls below a certain value instead of above.
Seems to be very accurate as well (the PH probe)
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i have the same unit (for a planted tank I was going to set up), and I find it very helpful. I just look at the monitor.
and yeah, a relay can make it trip whe pH falls below a certain value, instead of up.