PH meter + sump = need new PH meter

[kwirky]

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)

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.