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Thank you for the suggestions. With availability of parts, and no spare controllable sockets left, I've managed to wire up a 2-wire valve to an L-port.

It is open when unpowered, thereby rising pH...

Hello

Is it possible to control a motorised valve, like in the attached, with a Profilux 4?

This is to use a Co2 scrubber with the valve switching between the scrubber and regular air depending...