whats yer purpose for pumping? water for use outside the pond or for pond water circulation?

i would not think typical submersibles (the type installed in water wells) would be able to handle much silt or debris. the impellers are easily broken or stuck from use in dirty water.

if for pond water circulation it is much easier and cheaper to pump air. if for use outside pond, you need a pump that can handle sediment or debris laden water (i.e. trash pump).

thats my feeble 2c, lets see what anyone else has to say.

GSF are people too!