Resolving air leaks
An air leak is just as concerning as a water leak. Professionals may notice air in the strainer basket on the suction side of the pump. On single-speed pumps, the basket area would generally be full of water. Since variable-speed pumps run at lower speeds and flow rates, one may see air in the basket area, however, the air is not something to be alarmed by, nor is it a sign of a leak as it would have been with single-speed pumps. Air in the basket area generally means the amount of water going out of the pump and the amount of water coming in have reached an equilibrium.
So, how can one be sure there is an air leak? Running a quick-clean cycle is a good test. Quick-clean cycles run the pump at high speed. If, while the program is running, the strainer basket fills up with water, a professional can be confident the air was sucked out and there is no leak. However, when running at a high speed, air bubbles appear and the lid fills with air, it may indicate an air leak. Another simple way to test is by running a garden hose along the plumbing leading into the pump to see if it changes what is going on in the viewport.
Air leaks can be caused by a variety of factors. The ground shifting during changes in the seasons, fluctuating frost lines, or even ultraviolet (UV) rays that break down the components in the polyvinyl chloride (PVC) can all lead to an air leak. A cracked, stretched, or aged O-ring is also a common cause of an air leak and is often a relatively cheap fix. Replacing the O-ring, cleaning the groove it sits in, and applying a new coat of lubricant can often do the trick.
If the O-rings appear to be intact but an air leak remains, check the pump’s PVC plumbing. Over time and when exposed to the elements, the epoxy seal can become brittle and less effective. If an air leak stems from the plumbing, caulk can patch the crack, or the plumbing may need to be re-glued.
While leaks happen, steps can be taken to help avoid them. For example, protecting pumps from the heat by ensuring they are shaded from the sun and have ample ventilation. They should also always be protected from dirt and moisture.
