• Little Giant F-Series F40-5500 566727 Wet Rotor Pond Pump with 20-Feet Cord, 5500Gph
Highlights: 5500 GPH at 0' 20' grounded power cord 115V 60hZ 360 watts 2" MNPT and SPIG discharge and inlet Designed with multi-purpose flexibility right into the pump while their wet rotor technology makes them energy efficient They can be used submersed or externally and can be mounted vertically or horizontally With MNPT threads and fittings built-in, attaching fittings is a breeze The included pre-filter makes these pumps built for flexibility and durability in any decorative water application Constructed without mechanical seal or oil Accepts threaded fittings (Not Included) and accepts rubber coupling (Not Included) Modular add-on screen abilities allow you to increase pre-filtration Rope/Cable Loop on rear of pump for easy deep water installation retrieval Mounting holes in all four feet Easy carry handle
  • 20 Foot Cord, 5540 GPH @ 0 ft, 3 Amps, 360 watts, 21.3ft Max Height, 2-Inch MNPT Inlet and Outlet
  • Quiet Operation; Operates Submersed or Inline (Below Water Level)
  • Can be Positioned Vertically or Horizontally
  • Oil-free Design for Maximum Safety for All Pond Life
  • Rope/Cable Loop for Deep Water Retrieval

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Little Giant F-Series F40-5500 566727 Wet Rotor Pond Pump with 20-Feet Cord, 5500Gph

  • $300.77
  • $299.15

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Little Giant F20-2700 566725 Wet Rotor Pond Pump with 20-Feet Cord, 2700Gph

Little Giant F20-2700 566725 Wet Rotor Pond Pump with 20-Feet Cord, 2700Gph

Highlights: Dimensions: 9.93" L x 5.71" W x 7.54" H 2700 GPH..

$240.06 $240.92

Dynamic Head

The effect of the Earths gravity on the "lift" or head pressure is fairly simple; for every vertical foot of distance the pump moves the water you are adding one foot of head pressure so the ratio is a 1:1 ratio. The effects of the friction, caused by water as it travels through your hose or pipes, on the total head pressure is a little more difficult to calculate especially as there are slight variations in pipe friction in different hose materials and the smoothness of the inner bore. Basically. for every ten feet of pipe through which the water has to travel travel horizontally will contribute 1 foot of head height; the ratio of the pipe friction loss is a 10:1 ratio.

Plumbing fixtures and bends and corners in your hose also increase the total head you must calculate to ensure the proper final volume from your pump. Every corner with a 90 degree elbow in your plumbing will add 1 foot of head pressure  with a 1:1 ratio. 45 degree elbows, tees and even insert couplers can all have an impact on the final flow.

If you install a pump 40 feet away from the top of your waterfall which is 6 feet above the pump and the tubing is a single run of 40 feet horizontally then you add 4 feet of head for the tubing length (the 10:1 ratio) to the 6 foot differnetial between the pump location and the final height of the waterfall so your final total dynamic head calculation would be 10 feet. This means your final volume of water flow in this water feature or application would be the volume of flow on the performance curve that equaled the gallons per hour at 16 feet. This volume will certainly be much less than the initial volume the pump can move at an open flow or a zero head.

If in the above example your 40 feet of horizontal tubing run also required 3 elbows of 90 degrees then an additional 3 feet of theoretical head would be added and your final flow result would be at 19 feet on the performance curve of the pump. In this example you would want to choose a pump that has the desired GPH rating at 9 feet of head pressure.  Tubing size is also an important factor in accounting for head pressure loss, in general you should never reduce the diameter of the tubing below what the output size of the pump is, this will drastically increase head pressure, and reduce pump performance.  For maximum pump performance, using the largest tubing that is practical is the best choice. A best practice is to use a hose with an inner diameter that is the same as your pumps outlet fitting.