Sand in pool after backwash/rinse

[CarlD]

Yipes! That's about 10x as much as you should see!

Since I have an AG, I pull ALL the plumbing off to close and the way to do that is have quick-connect unions everywhere. Also, to isolate a section without having to plug returns, drains and the skimmer, ball valve unions make it faster and easier, say, for example, when you need to clean the pump's strainer basket, or clear SWCG protective screen. Or pull out your multi-valve!

[dcarlton]

Was going to chime in as this was actually the same problem I had today. Was getting sand in the pool after replacing XL valve and it working great for 12 hours. Went to backwash and really had no backwash pressure and really no rinse AND it was leaking out the waste port.

Thought is was the spider gasket (no), then a broken lateral (no) but like you discovered my pipe snapped at the lateral assembly. Replaced and back in business for now.