New to the site and thought I would ask some of the experts out there about this topic. My neighbor and I had pools put in three years ago and the company we dealt was a reputable pool installer(we did some research) just outside Toronto, Canada. At the time the pools were installed they put in a drainage or a vacuum pipe as I believe its referred as to the side of the pool(approx. 4-5ft in the ground). After heavy rainfalls or thawing after winter we are constantly running our pumps to get rid of the ground water that builds up essentially behind the pool liner. I am very thankful that this was put in at the time of install as I never recall growing up friends having such a system for ground water. At the time I was told it was done due to the water levels in our area being high, the only thing I cant figure out is my brother in law had a vinyl liner pool put in at his place and he is in the same subdivision but different company and he never has any issues with water behind the liner. May be a different type of drainage system was put in that him nor I are aware of. Anyways long story short, I just wanted to ask those out there in the business is this typical practice with vinyl liner inground pools these days due to the way subdivisions are built? I find every spring im pumping out plenty of water especially after these last two brutal winters and pushing out quite a few wrinkles with the brush once the pool is open. It was certainly something that they didn't mention when we signed up for the pool. lol I just want to know if this is all normal practice these days with inground pools?