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Question DetailsAsked on 7/5/2016

I am loosing pressure when I start my above ground pool

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1 Answer


Don't know what type of system you have - some above ground pools have basically the same configuration as in-ground, some much simpler - so I will address it as if this were a full-capacity system.

If you mean losing pressure at a gage on the inlet side of the filter, then if pressure initially builds but then drops off usually an piping inlet blockage. Tthe scupper/gutter inlet and the bottom main drain piping connect together somewhere before the pump (sometimes underground,sometimes right before pump), so if you are getting just somewhat reduced flow only one of those is likely plugged (usually at the inlet or scupper/gutter screen leaf basket) - if near total loss of flow and pressure then blockage likely on the pump side of where the two pipes come together - at a valve near the pump or in the pump itself commonly.

Rarely a malfunction in the filter flush valve can cause it to partly or completely open even though not in flush mode - so your pump-side of the filter pressure drops off significantly as the filter is being partly bypassed. Being stuck in the backflush mode also almost always results in signficantly reduced pressure because instead of being forced down through the filter media (sand or whatever) the water is coming up through it from the bogttom and "floating" and agitating the media, so between that lower resistance and the commonly lower piping resistance of the drain pipe versus the return to the pool, you can get a half to more than three-quarters drop in pressure during backflushing. And of course, if the filter bypass valve is open or partly open you would get less pressure on a filter pressure gauge - though I would not expect dropping off of the pressure, just lower pressure because of the lesser flow resistance around than through the filter.

If the pressure gauge you are talking about is on the outbound side of the filter like on a chlorinator or such, then likely a filter problem - if you have a bypass around the filter turn it on and see if the pressure increases at the gage - if so, filter is the problem - plugged up or flush valve is open.

If you are getting gurgling and air slugging through the pump, then you have a broken pipe, partly open drain valve on the inlet side of the pump, or the pool water level is so low that the gutter inlet is sucking air rather than water. Can also happen when there is a blockage in the gutter/surface skimmer inlet BEFORE the strainer basket, so the basket is going dry.

One other common cause of this - suction-driven skimmer or pool cleaner is connected but not in the water (or its port is open) so it is letting air into the system.

Answered 4 years ago by LCD

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