Once you believe you know how much flow you want in gallons per hour (GPH); typically 1 to 2 times the size of your pond in gallons, the next factor you must determine is the dynamic pump head of your system.
Without the dial selectable horsepower feature with the Money Saver Pumps® you need to calculate the exact horsepower your pond requires. Then, and only then, can you choose a pump with the proper horse power. This calculation is difficult for the novice, and involves friction losses; caused by the water rubbing against the pipe, and during turns, while going through filters, UV lights, valves, unions, T's, etc. You also need to know the flow going through the piping system, and the pipe diameters.
Next, even with the proper horse power, your piping system limits how much flow you can get. For instance, don't expect to get more than 1,800 gallons per hour through a 1 1/2" pipe without greatly increasing the pump head, and required horsepower; see http://www.MoneySaverPumps.com/tdh,htm and the following table:
One of the most ridiculous statements is, "you want low horse power and high flow". That is not how it works; high horsepower gives you high flow; low horse power gives you low flow. In fact low horse power can result in no-flow at all. When you see a pump that says "maximum pump head", that means any pump head greater than that will result in no flow at all.
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