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I think the only thing that causes water to shoot back is when air has been pulled into the filtration system. This usually happens on the suction side, between the skimmer and the pump. The air will accumulate in the top of the filter. It is subject to the same amount of pressure as the water in the system, but air will compress and store the pressure, like in an air tank. When the pump is turned off the air expands back to it's original volume, pushing out the water in the tubes connected to the filter. But an 8 foot spray sounds like a lot of pressure! Check the pump basket lid seal/o-ring for leakage. Watch it when you switch off the pump. If the water in the basket disappears, the problem is air in the filter. With the pump running, check to be sure the hose from the skimmer is not collapsing. Also if there is a tube on the return side of the system that is not in use and is capped at the pool, it may be filled with air and storing the pressure. I can't think of anything else. Good luck. One other thing. After you replaced the sand in the filter, did you run the pump with the valve in the backwash position for about 2 minutes to purge the air from the filter?

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Q: How do you fix the problem if even after replacing the sand in your pool filter the skimmer basket still blows out with water about 8 ft high when you turn the pump off?
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