It is...1/10hp Drummond transfer pump from Harbor Freight. Originally bought it to water grass seed after having the pond dug last summer (right before the drought)...lasted one week then I went and bought the 1/2hp pump to run two sprinklers simultaneously.
My pond is up about a foot from when I took this picture, which should help immensely with flow - that little Drummond doesn't much care for 4' of nearly vertical intake lift but does a pretty nice job with 18" or less rise from water to pump.
The Sawyer filter is more than sufficient for clean drinking water, but I had the RV filter too and thought "what the heck".
We bought a Berkey filter to filter our lake water if need be.
Move the pump down next to the water to eliminate as much negative head as you can. Centrifugal pumps are designed to pump liquids....
Treating the water would be the issue. Most ponds in neighborhoods have tons of chemicals dumped into them