I have been told that I should install a sump pump and a rock pack under my IG pool. This is due to expansive soil and they do not want any water to stay if it gets under the pool. Has anyone ran into this? Can I have the pump outside of the pool and not under it? I am concerned that if the pump goes out I will not be able to get to it if it is under the pool. Can I create a drywell and just have a tube in the drywell. Then run the pump when it rains or on some interval? Thoughts?