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When replacing a fountain pump or choosing a new 1, first there are some key terms to maintain in mind: "Head": This is the maximum vertical lift of the pump. For example, a 6' head indicates the pump is rated to pump water up to 6 feet high. Note, nevertheless, that at 6 feet the pump would be supplying very small water, with gallons per hour around zero. So if you need to pump, say, 200 gph at 72", you will most likely need about a 300-600 gallon per hour pump to do the job. "GPH" : Gallons per hour, generally rated at different heights "GPM" : Gallons per minute, usually rated at various heights "Pump Curve" : The quantity of water volume "curved" according to different heights. A 500 gallon per hour pump, for instance, might pump 500 gallons per hour at " lift, 350 gallons per hour at 24" of lift, and so forth. When getting a pump for the very first time or when looking for a replacement pump, it is crucial that you know how several gallons per hour you want to pump and at what height (head). Water Volume The total volume that you will be pumping is controlled by a handful of variables. One particular aspect is the size of the pump, as covered above. But you also should contemplate 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 minimize water flow. Several buyers are shocked when they find that, right after hooking up their 500 gallon per hour pump to 1/two" inside diameter tubing, they are only obtaining what they take into account a trickle. We had an engineer do some calculations for us to illustrate the issue. Using a 300 gph pump with 1/2" tubing is going to restrict your flow to 253 gallons per hour. By rising the pump to 450 gallons per hour, but nonetheless employing 1/two" tubing, you will enhance volume only slightly, to 264 gallons per hour! The lesson is this: When acquiring a pump, find out what size of tubing is supposed to go with it. One more problem is operating the tubing too far. Extended lengths of tubing create resistance. If your pump calls for 1/two" i.d. tubing, for instance, but you are operating the tubing twenty feet from the pump, it is a great notion to use 3/4" tubing instead so as not to cut down too significantly on flow. How considerably water do I need to have? What size of pump? This question is answered in component by whether you want a "trickle" or a roar. When you buy a fountain, you will usually uncover a suggested flow. For waterfalls, use this as a rule of thumb: for every single inch of stream width or waterfall "sheet," you will want to deliver 100 gallons per hour at the height you're pumping. So if you are developing a 12" wide waterfall that is 3 feet tall, you need to buy a pump that will be pumping 1200 gallons per hour at 3 feet of height. For modest ponds, whenever achievable, it is a excellent concept to recirculate the water when an hour, much more often if attainable. Therefore, if your pond is 500 gallons, try to acquire a pump that will recirculate water at a rate of 500 gallons per hour. For actually huge ponds, this is not essential and is far too high-priced. kangen water machine