Sand in above ground pool

[Grange]

This year, I replaced my lateral since I previously had sand in the pool. I used the suggested 200lbs and your typical pool sand. I was careful to center the pole and I completely covered the top with duct tape when I poured the sand in. Yet....I still have sand in the pool. I can only guess that maybe when I backwash, it rises and goes down the lateral pole. Any thoughts or suggestions?

[Teapot]

On backwash any sand loss into the center pipe goes down the waste pipe and not into the pool. Suggest you check the multiport valve gasket ( spider gasket)

[Grange]

tks for the reply but what exactly am I checking it for? Should I just replace it? Not sure how the multiport would affect sand going in the pool but I'm open to suggestions.

[Grange]

tks for the reply but what exactly am I checking it for? Should I just replace it? Not sure how the multiport would affect sand going in the pool but I'm open to suggestions.

[Teapot]

Broken or displaced spider gasket instead of a seal in the valve you could have a gap. It's easier to check than stripping down a filter, it only takes minutes to check. At least then you can rule it out and look to the air bleed pipe in the filter, the laterals or hub.