OK, let me first say this I am a heavyweight, I weigh 385 and I am in the pool yesterday and was walking around, and sometimes where I would step it would fill like a depression in the pool floor is this normal or has the underside of my liner been compromised, liner yep its a vinyl liner. Anyways the main reason I ask is because last summer my pool had a knew liner put in and I was just wandering did I get a screwjob???