I am doing a replaster and the guy made me sign something saying it was my choice to stick with my current 1 main drain scenario currently in place. Pool is 30 years old. Then a pool maintenance guy who is going to show me the ropes and do the opening of the pool said that it could be dangerous to not have the 2 drains for safety. Apparently when there are two drains and someone is sucked down there, does something release if it senses blockage? With 1 drain I am a afraid we could have a safety issue. Is there anything I can do short of putting in another drain that would make the situation safer? Isn;t there a way to program the pump to sense a blockage like that? Thanks!