Need help selecting a pump

I was wondering if anybody would be able to assist me in selecting a pump to use with my bulk reef supply 75gpd RO/DI unit. What I'm trying to do is extend the life of my DI resin. I want to run my RO water into a container, let it gas off for a few days, then pump it through the DI canister into another container. The RO unit would be about 2-3ft higher then the first container. I bought an Aqualifter AW-20 but it's not enough.



Anybody have any good ideas for what to use with this application? Inline or submersible....doesn't matter