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CHOOSING THE RIGHT SIZE POND PUMP

1.    SAFETY FIRST !  Water and power can be fatal!

All installations should be constructed, commissioned and maintained according to any relevant government laws, by-laws and regulations and according to the instruction manual provided with the product. Running garden pumps on extension leads is illegal. An earth leakage (RCD) device must be fitted. Any 240 volt electrical work must be carried out by a licensed electrician.

Recommended usage for lengths of power cable/cord on pumps:

  •  3 pin plug – 2m or 3m cable         minimum length for outdoor use (patios, decks, courtyards)
  •  3 pin plug – 10m cable                  recommended length for outdoor installations; however no more than 2m should be left uncovered by conduit or similar, and  cable  must not be left tightly wound in a coil.
  •  2 pin plug – 1.8m cable                indoor use only, aquariums and table fountains
          TIP !  Pumps don't last forever.  Always install to allow easy access and replacement !

2.    CHOOSE THE RIGHT FLOW RATES

Make sure you get it right the first time or your customer will not be happy. Try to get them to tell you what they want – tell them to use a garden hose to do a mock-up and get a rough idea of what they are trying to achieve.

                Suggested flow rates:

  •   Wall and table fountains                                              200 to 300 L/Hr
  •   Small statues to 400mm high                                      400 to 500 L/Hr
  •   Medium statues to 800mm high                                   600 to 750 L/Hr
  •   Large and tiered statues to 1.5m high                       1000 to 1200 L/Hr
  •   Statues over 1.5m and pond cascades                     1200 to 2000 L/Hr
  •    *Waterfalls and streams up to 0.4m wide                 3000 to 4000 L/Hr
  •    *Large waterfalls and streams up to 1.0m wide       6000 to 12000 L/Hr

                *See our waterfall pump and tubing size guide in our WATER GARDENING catalogue for further information.

          TIP !  Add 20% to required flow-rates to allow for friction loss in pipework.

3.    DON’T FORGET THE HEAD HEIGHT!

Measure head height from the water level to the highest outlet. Add together the flow rates required, add 20% for friction losses. If more than one function is being performed by the one pump, then choose a pump that can give the total flow at the highest height.

         TIP !  Remember it is easier to throttle back an oversized pump, but there is nothing you can do with an under-sized pump !

4.    POND SIZE – TURNOVER RATES

              Suggested turnover rates:

  • Ponds up to 1000L           once per hour
  • Ponds 1001-5000L           once every 2 hours
  • Ponds 5001-15000L         once every 3 hours
  •  Ponds over 15000L         once every 4 hours

         TIP ! High fish stocks and koi ponds will require higher turnovers.  Discuss this with your dealer for further advice.

5.    TUBING SIZE AND LENGTH

Too small tubing over a distance severely restricts the performance of the pump.  Long runs and high waterfalls may require larger diameters or multiple tubing.  Please enquire if in doubt.

               Suggested tubing sizes:

               Flow in L/Hr            Tubing Dia.                 Flow in L/Hr           Tubing Dia

                300-600                      12mm                     5001-8000              32mm

                601-1200                    16mm                    8001-15000             40mm

               1201-2000                   20mm                   15001-20000             50mm

               2001-5000                   25mm                    over 20000               Please enquire

 

6.    COST TO RUN PUMPS - The Cheapest pump is not necessarily the best long term option!

Example: A REEFE® RP18000 L/Hr filter and waterfall pump (250 watt) costs approximately $550.00 per year, run continuously. In comparison, a ¾ hp pool pump 15000 L/Hr (550 watt) would cost approximately $1220.00 per year, run continuously. So a short-term saving becomes a long-term liability!

         TIP ! Have an electrician set up a daylight sensor switch on waterfall pumps so the pump turns off at night - this saves power and money !

7.    DIMENSIONS OF PUMPS

We have included the dimensions of all our pond pumps in this catalogue. The sizes are in mm and include the cable exit in the length, and outlet height in the overall height.

8.    DRY-MOUNTING POND PUMPS, IN-LINE USE

Pond Pumps are not designed to be self-priming, so when they are installed in a dry mount or in-line situation, they must have “flooded” suction.  That is,  the pump must be installed below the water level so that the water gravity-feeds into the inlet of the pump.  When dry-mounting, it is also necessary to protect the pump from the sun to avoid over-heating, and install a prefilter of some sort to prevent particles entering the suction line and blocking the pump.  Not all pond pumps may be dry-mounted, check the tables in this product guide , there is a column that is headed.  “DRY-MOUNT FLOODED” if this says NO, then you cannot use that pump in a dry-mount situation

9.    Note that these guidelines are broad generalisations, and may not suit every application.

Please consult your retail specialist for more information and advice.  It is the user’s responsibility to ensure that the product chosen is suitable for the users application.  Incorrect use of products voids all warranty.