Hi GreenAmy,
It depends on how big is your pond / aquarium.
The following are some good choices for pond filter / pump.
TetraPond Debris-Handling Pump Energy Efficient Up to 1500, 3000, 4000 Gallons
Aqua Pulse Hybrid Drive Submersible Pump Aqua Pulse Hybrid Drive Submersible Pump Up to 280-4000 Gallons
Tetra Pond Water Garden Pump, Powers Waterfalls/Filters/Fountain Heads Tetra Pond Water Garden Pump, Powers Waterfalls/Filters/Fountain Heads Up to 50-1500 Gallons
Little Giant WGP-65-PW Premium Pond Dual Discharge Pump Little Giant WGP-65-PW Premium Pond Dual Discharge Pump Up to 1000 Gallons
AQUANIQUE Waterfall Pump AQUANIQUE Waterfall Pump Up to 650 Gallons
Alpine PAL2100 Cyclone Pump Alpine PAL2100 Cyclone Pump Up to 1000 Gallons
Laguna PowerJet 600 Fountain/Waterfall Pump Kit for Ponds Laguna PowerJet 600 Fountain/Waterfall Pump Kit for Ponds Up to 1200-5800 Gallons
EcoPlus Submersible Water Pump EcoPlus Submersible Water Pump Up to 40-3700 Gallons
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