Just changed filter sand five days ago. Sand filter is above ground Hayward.
If the laterals were broken you'd have sand blowing into the pool when in normal filtering mode. I agree that it is likely that the sand was simply overfilled.
Old sand broke down or bad laterals broken or cracked letting sand go through
But...
if a lot of sand is discharging, and pump is sized properly with the filter, then you have broken lateral drain assembly/bottom manifold.
A little sand in backwash is not uncommon. Many packaged sand filter systems use pumps whose flow rates greatly exceed the flow capacity of the filter.(the more horsepower the better, right? - Wrong) If this occurs only during back flush the the pump is too strong or the sand level is above the beginning of the rounded top of tank. The sand level will eventually correct itself.
SOURCE: sand in backwash
You need to replace the seal in the head unit of the filter.. The sand should be replaced every three years or buy a cleaning solution.
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