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I would put it in with your auto water change dos also chances are you'll never need it but it's there just in case. If you had it in with your auto water change dos it would of notice your pH increasing from your alkalinity additive and it would have stopped your auto water change dos. Your...
You can put the code in each of your dos heads advanced code menus. Just in case it happens again your alkalinity will cause your pH to go up then the Apex will shut it off. You have to but it in like this or it wont work.
If PH > 8.40 Then OFF
I used a Herbie overflow on 2 tanks once you dial it in it's pretty much silent. Running a bean animal now which is pretty much the same just an extra drain.