| A pump is one of the most significant features of | | | | difficult because these pumps have two ratings, |
| an artificial pond. In the absence of a pump, there | | | | GPH and maximum waterfall height. The height of |
| will not be any moving water, which may result in | | | | a waterfall is generally measured from the top of |
| a marsh. A pump is necessary for circulating and | | | | a pump to the top of a waterfall or a stream. |
| filtering water in a pond. Usually, it is | | | | A rule of thumb that is normally applied is that |
| recommended that the pond water should be | | | | each inch of width of a channel will require an |
| circulated at least once every two hours. This | | | | extra 100 GPH. A smaller pump with a large head, |
| prevents the accumulation of mosquito larvae | | | | and preferably with an adjustable flow control, is |
| over the stagnant water surface. Moreover, it is | | | | required in order to feed water into a statue or |
| advisable to determine the quantity of water in a | | | | fountain. |
| pond and get a pump that pumps at least half | | | | A multi-purpose pump is the best choice for a |
| that volume every hour. In other words, the | | | | person who is not sure which pump to select. |
| gallons per hour rating, or GPH, should be 50% | | | | Magnet-driven multi-use pumps typically have |
| that of the total pond volume. | | | | mechanical pre-filters containing a special sponge |
| Pond pumps are electrical devices and require a | | | | mesh for trapping bulky debris. They also have |
| water-resistant cord. The cord may be concealed | | | | adjustable flow control, built-in fountain with |
| between a pond and an outdoor electrical outlet. | | | | several fountainheads, and diverter valves to split |
| Pond pumps are installed under water, and | | | | the output stream into multiple devices. They do |
| normally do not generate any distracting noises. If | | | | not require a coolant and consume less electricity. |
| a pump is supposed to house both fish and | | | | It is recommended to place pond pumps at the |
| waterfalls, then the pump rating (GPH) should be | | | | opposite end of a waterfall or a fountain in order |
| increased. | | | | to allow maximum amount of circulation. |
| Determining an appropriate pump for waterfalls is | | | | |