ATO preparation/Stuff wanted (EDM)

[Reef Supplies]

Mode B adds more protection against adding to much top-off. The other modes are safe but B is best. It will be easy for you to guage how much much RO water to add to your resevoir once you know how much evaportaes, so unless you really forget about it hard to make it go dry.

Originally Posted by paddyob

I don't really get why mode B is better.

You would think using one sensor in the sump would be the same, with less water drop.

I understand that in mode B one sensor notices lower level..., one the max.

And in mode A... One sensor does both.... Float drops... Water rises... Float rises.

Being a first time ATOer.... Maybe I am missing something. Please fill me in.

But I do agree about a $20 pump.

Thanks