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When replacing a fountain pump or deciding on a new one particular, very first there are some crucial terms to keep in thoughts:  "Head": This is the maximum vertical lift of the pump. For instance, a 6' head indicates the pump is rated to pump water up to 6 feet high.  Note, even so, that at 6 feet the pump would be providing really small water,  with gallons per hour around zero. So if you want to pump, say, 200 gph at 72",   you will most likely require about a 300-600 gallon per hour pump to do the job.  "GPH" : Gallons per hour, usually rated at distinct heights  "GPM" : Gallons per minute, typically rated at various 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 " lift, 350 gallons per hour at 24" of lift, and so forth. When acquiring a pump for the initial 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 height (head).  Water Volume The total volume that you will be pumping is controlled by a couple of aspects. A single element is the size of the pump, as covered above. But you also should take into account how wide your tubing will be. Tubing is measured in two ways: inside diameter (i.d.) and outdoors diameter (o.d.). Really skinny i.d. tubing will drastically reduce water flow. Several consumers are shocked when they find that, after hooking up their 500 gallon per hour pump to 1/two" inside diameter tubing, they are only acquiring what they think about 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 increasing the pump to 450 gallons per hour, but nevertheless employing 1/two" tubing, you will enhance volume only slightly, to 264 gallons per hour! The lesson is this: When buying a pump, uncover out what size of tubing is supposed to go with it. One more dilemma is running the tubing too far. Extended lengths of tubing develop resistance. If your pump calls for 1/two" i.d. tubing, for instance, but you are running the tubing twenty feet from the pump, it is  a great concept to use 3/4" tubing rather so as not to cut down as well a lot on flow.  How significantly water do I need to have? What size of pump? This query is answered in element by no matter whether you want a "trickle" or a roar. When you acquire a fountain, you will generally find a encouraged flow. For waterfalls, use this as a rule of thumb: for every single inch of stream width or waterfall "sheet," you will need to have to deliver 100 gallons per hour at the height you are pumping.  So if you are creating a 12" wide waterfall that is 3 feet tall, you want to acquire a pump that will be pumping 1200 gallons per hour at three feet of height. For small ponds, whenever achievable, it is a great idea to recirculate the water after  an hour, far more frequently if attainable. Therefore, if your pond is 500 gallons, try to get  a pump that will recirculate water at a rate of 500 gallons per hour. For really [http://www.amazon.com/Water-Ionizers-Made-Easy-ebook/dp/B008MPHQOS/ article]  huge ponds, this is not necessary and is far also costly.