topoff ?

[Jimsreef]

Can some one tell me how the evaporation level will affect this sump. Will a float switch work and where would I place a float switch?

[moonpod]

Your float can be in any of the three chambers. If you use a float, figure out what the "travel" of the float is b/c once the evap falls below the level of the upgoing baffles, there will be NO water flow through the sump. Personally I like the tunze osmolator--no "travel" essentially. Keeps water level w/in millimeters. You probably don't want the float in the section w/the skimmer/return b/c it may be turbulent in that section which messes w/them.

[Jimsreef]

since my baffles are 10 inches high wont my level in the sump stay there until the water level falls in the main tank. Jim

[moonpod]

no the evap shows up in your sump first. The overflows keep the tank water level steady while the water levels drop in your sump.