I wouldn't want to rely on metering water in and out - it'd never be completely consistent and the level would gradually drift.
I am thinking of making an auto water changer for my reef aquarium. I already have a pump thatpumps water out and another to pump water in but I have to plug them in and then unplug them was going to use floats and timers but it has been tricky getting them timed right. So is it possible to put a water meeter inline with each pump and set them up with an arduino so once a week or every other week the drain pump will pull out a set amount of water and the fill pump will then put back that amount?
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