No good will come of this.
So apparently haunted swimming pools are a thing in Blumhouse land.
It's walking a difficult path: an unusual setup, real attempts to cover people facing reduced circumstances and seemingly a desire not to go for the really cheap jump scares. There are a few but so well telegraphed they're just not scary.
So it's kind of between two stools and thin on material. Well made, well acted but just very bland.
Don't bother 5/10.