Home Page>Company News>"GPH": Gallons per hour, usually rated at different heights

"Pump Curve": The amount of water volume "curved" according to various heights. A 500 gallon per hour pump, for instance, might pump 500 gallons per hour at 0" lift, 350 gallons per hour at 24" of lift, and so forth. When buying a pump for the first time or when seeking a replacement pump, it is essential that you know how many gallons per hour you want to pump and at what heighth (head).

Water Volume: The total volume that you will be pumping is controlled by a few factors. One factor is the size of the pump, as covered above. But you also must consider how wide your tubing will be. Tubing is measured in two ways: inside diameter (i.d.) and outside diameter (o.d.). Very skinny i.d. tubing will greatly reduce water flow. Many customers are shocked when they find that, after hooking up their 500 gallon per hour pump to ?" inside diameter tubing, they are only getting what they consider a trickle. Well, about the most they will get is 200 gallons per hour or so under the very best conditions. They have restricted the flow too much by choosing skinny tubing. When purchasing a pump, find out what size of tubing is supposed to go with it. Another problem is running the tubing too far. Long lengths of tubing create resistance. If your pump calls for ?" i.d. tubing, for instance, but you are running the tubing twenty feet from the pump, it is a good idea to use ?" tubing instead so as not to cut down too much on flow.

Company Resource:   Swimming Pool Heat Pump, Mini-chillers
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