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Perfect, thank you.

Thank you however that isn't quite what I want.

I want to keep the automatic dosing, say 10ml every 30 minutes, but STOP dosing if the pH rises above a certain point. I don't want to dose in order...

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I'd like my dosing pump to do a fixed dose every 30 minutes, which is easy enough. However, if the pH of the tank is higher than a set amount I don't want it to dose at all.

I'm assuming this is...