Welcome to the forums Rick,

I am not seeing any quick info on Matala's site for the "LP1", so it's hard to advise on the system. You should be looking at about a 1/4 HP pump and at least 2 diffusers, but more like 3 (depending) for your 1/3 acre pond. Post the specs of the system for a better response from the other PB members.

As far as 220 vs 110...go with 220 if you can. It will be a bit more efficient and cheaper to run the pump and, as you know, you will be able to get 110 from that for other items.


Fish on!,
Noel