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I agree, stay with the sand filter. I've owned 2 in-ground pools and sand filters do an adequate job and are simple to maintain.
My current pool is around 9 years old. I replaced the sand about 6 years ago. My pool gets such light usage that the sand really didn't need to be replaced at the time.
You should have an O-ring at the top of the stand pipe between it and the 5-way valve. (assuming your setup is similar to mine.) Attached are some pics I took when I replaced my sand.
The first pic shows the bottom of the 5-way valve and the 2 O-rings. The second pic is the stand pipe removed from the filter body.
When you replace these O-rings, be sure to give them a good coat of silicone lube.
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