If you are considering installing a large water feature in your yard, then you will want to look into external pond pumps. These units are designed for exactly what you are going to need and once you put one in place you will see how much of a work horse it really is in performing it's job. They are designed specifically to be more efficient and still handle larger volumes of water effectively.
Anyone who has ever seen a pond may or may not have noticed that the pump is typically submerged in the water, out of sight and out of mind. The great thing about this is that you only need to monitor it if something goes wrong or if it needs cleaning. Other than that it is pretty self sustaining. But the location of one of these types is completely out of the water. This may cause a little bit of a problem since they will be heard. And if you do not want to have to look at it you will need to find a way to camouflage it with it's surroundings.
Since the pump is on dry land, an important feature is to make sure that you buy a pump that is self priming. By that, it means that the pump can take water into itself as needed. If your electricity goes out, the pump will drain. When the power returns the unit comes back on dry and burns up. There are two classic solutions to this problem. One is to install a check valve, and the other is to place the unit below water level and let gravity work for you.
One of the most important things to remember when purchasing these external pond pumps is making sure that you get the right size. This is absolutely crucial to the life of your pond, since the pump is the central point of the entire feature. When sizing a pump you need to know how many gallons your feature holds. The appropriate one will cycle the water volume once every hour. So if you have a pond that holds 1000 gallons then your pump needs to be a 1000 GPH (gallons per hour) pump. Anything less and you are wasting your time and money.
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