It is very important to abide by these ratings. Most pond equipment such as the filter, skimmer, or ultraviolet clarifier may have a minimum and/or maximum rating provided by the manufacturer. For a trickle effect you can use closer to 50 GPH per inch or for a heavy flow closer to 200 GPH per inch. This means that even if the pond is only 1000 gallons if you want a 12” waterfall spillway then the pump would need to provide around 1200-1800 GPH. For the typical waterfall effect you will want 100-150 GPH per inch of waterfall width. However, in these situations you should strongly consider additional aeration in the form of an air pump. In other words, according to the prior rule of thumb an 8000 gallon water garden needs at least 4000 GPH, but in fact you may be able to get away with less. Larger ponds (over 5000 gallons) can start to decrease the turnover rate. Koi ponds need a higher turnover rate and the minimum is the full volume every hour. This means for a 2000 gallon pond you should be pumping AT LEAST 1000 Gallons Per Hour (GPH). For water gardens (ponds with plants and goldfish) you want to circulate at least half of your total volume every hour. There are many factors that help determine the proper flow rate for your water feature. This article will step you through the various factors in pump selection to make a more informed decision. But with hundreds of different pond pump models on the market it can be daunting. Choosing the right pump for the job ensures your best chance for maximum enjoyment of the feature for yourself as well as for any aquatic inhabitants. It also provides the sights and sound of moving water in these and other types of water features. In a water garden or koi pond the pump provides the circulation, provides oxygen, and operates the filter. The pump is the lifeblood of most water features. How to Select a Pump For Your Water Feature
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