Considering ATO

[fishytime]

Originally Posted by Reef Pilot

(not sure how, as they are pretty simple mechanical devices).

salt creep, snails?

[Reef Pilot]

Originally Posted by fishytime

salt creep, snails?

No snails in my sump. Salt creep doesn't have a chance to form, as the water varies enough (with water changes, skimmer cleaning, other fiddling around) and washes it off. Besides, I have the higher back-up one that would kick in.

The 2nd higher float gets exercised regularly too, when I vary the water level, with other stuff I am doing in the sump. Lowering the skimmer water level (to clean it) happens at least once a week, which then raises the sump water level.

And once in a while, I test them, by just pulling the float down with my finger.

When water flows in through the float valve, I can hear it quite clearly (like a fizzing) so easy to keep an eye on it.