Top off water circulation?

[kim7]

Hello reefers, I have a 20g long. I'm have another 20g to keep my RODI for auto top off. My question is, should I keep the rodi water circulated or just still. And should I keep a lid on it to prevent evaporating?
Thanks

 

[bif24701]

Hello reefers, I have a 20g long. I'm have another 20g to keep my RODI for auto top off. My question is, should I keep the rodi water circulated or just still. And should I keep a lid on it to prevent evaporating?
Thanks

A cover to prevent things getting into it, that's all. No need to keep is moving, if you use Kalk you certainly don't want to touch it after mixing.

 

[kim7]

What's kalk?

 

[PatW]

Kalk is CaOH. It is highly basic. Coral skeletons are made of calcium carbonate. The corals deplete calcium and alkalinity from the tank water as the corals grow. Kalk is a way to add calcium and alkalinity back in. Putting it into the ATO makes the addition automatic.