A friend of mine recently moved into a house with a pool that has been not been maintained for an unknown period of time. As far as we know it has been left uncovered for at least 5 years. The sand filter housing is cracked all the way around so we know we'll have to buy a new one. I'm guessing the previous owner did not properly close the pool and it gets down to zero degrees F here in the dead of winter.
The water itself looks more like a stagnant pond than a pool. I'm fairly certain there are creatures living in the pool. I can't imagine trying to treat the existing water.
Am I correct to assume that the water should be completely drained? Should we scrub the liner and what with? What other steps do we need to take to get headed in the right direction?