AquaMedic 3 pump doser for Auto Top off

[tank41]

Hello. I am possibly purchasing a aquamedic 3 pump doser. I would be using two pumps for brs two part but was wondering how the 3rd pump would work as a auto top off. I know it would just be a matter of calculating how much evap you use a day and setting the pump up to dose my RO/DI water that way. Will the pump be strong enough to pull water from my 55 gallon water storage container that is about 4 feet away from sump with about a 4 foot lift.
Thanks

 

[Reverend Reefer]

i have the two pump doser and my two part dosing containers are 5 feet away. i placed the dosing pump closer to my sump (as opposed to closer to the containers), no problems. my lift is only 12 inches though but the guy i got it from said it can lift 8 feet no problems up to his display from a resevoir on the floor....

 

[Reverend Reefer]

its probably not the best setup for an auto-top off, which i'm sure you know. i ended up using a cheap aqualifter + float switch for my auto top off.