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When replacing a fountain pump or deciding on a new one, 1st there are some essential terms to hold 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 delivering extremely small water, with gallons per hour about zero. So if you require to pump, say, 200 gph at 72", you will probably need to have about a 300-600 gallon per hour pump to do the job. "GPH" : Gallons per hour, generally rated at diverse heights "GPM" : Gallons per minute, normally rated at various heights "Pump Curve" : The amount of water volume "curved" according to various heights. A 500 gallon per hour pump, for instance, may well pump 500 gallons per hour at " lift, 350 gallons per hour at 24" of lift, and so forth. When acquiring a pump for the 1st time or when looking for a replacement pump, it is vital that you know how a lot of 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 few elements. 1 aspect is the size of the pump, as covered above. But you also need to consider how wide your tubing will be. Tubing is measured in two approaches: inside diameter (i.d.) and outdoors diameter (o.d.). Very skinny i.d. tubing will tremendously lessen water flow. Several buyers are shocked when they uncover that, immediately after hooking up their 500 gallon per hour pump to 1/2" inside diameter tubing, they are only acquiring what they take into account a trickle. We had an engineer do some calculations for us to illustrate the issue. Utilizing a 300 gph pump with 1/2" tubing is going to restrict your flow to 253 gallons per hour. By escalating the pump to 450 gallons per hour, but still employing 1/2" tubing, you will improve volume only slightly, to 264 gallons per hour! The lesson is this: When purchasing a pump, locate out what size of tubing is supposed to go with it. Yet another difficulty is operating the tubing also far. Long lengths of tubing produce resistance. If your pump calls for 1/2" i.d. tubing, for instance, but you are operating the tubing twenty feet from the pump, it is a excellent thought to use three/four" tubing as an alternative so as not to cut down as well significantly on flow. How considerably water do I require? What size of pump? This question is answered in component by whether or not you want a "trickle" or a roar. When you buy a fountain, you will generally uncover a recommended flow. For waterfalls, use this as a rule of thumb: for each and every inch of stream width or waterfall "sheet," you will require to deliver 100 gallons per hour at the height you're pumping. So if you are building a 12" wide waterfall that is three feet tall, you require to buy a pump that will be pumping 1200 gallons per hour at three feet of height. For small ponds, whenever achievable, it is a excellent concept to recirculate the water when an hour, much more frequently if attainable. As a result, if your pond is 500 gallons, try to buy a pump that will recirculate water at a rate of 500 gallons per hour. For actually significant ponds, this is not required and is far too pricey. ionizer oasis reviews