sand in pool intex sand filter

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No, that wouldn't cause sand to get into the pool. The small hose would make it difficult to throughly clean the filter and might cause the pressure to go up over time even with backwashing, but it wouldn't let sand into the pool.

If it is only a tiny amount of sand I wouldn't worry about it. But if sand is routinely getting into the pool you probably have a broken lateral (a part inside the filter).
 
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