I have been running a pool filter on my pond for 5+years. (10ft wide) The sand quickly clogged in the filter canister when first installed and I replaced with Bio balls, and have not changed or even serviced the filter canister since. The problem that I had to deal with was the 1/2hp pump. It creats a lot of water flow, and we had to plumb 3 different outlets so the pond didnt turn into whitwater rapids. When I saw this package deal at a pool supply place (1/2 hp with 20 gal
canister for $500) the price seemed right to me.