What to do if main drain in pool doesn't drain?

If the main drain in your pool does not drain it is either a minor or major fix. The minor fix is to first look at where the water comes out and see if there is something stopping the water from coming out. IF not you will need to rent a pump and drain the water......After that you would need to remove the grate in side the pool and reach inside to see if there is an obstruction. If none is seen then I would use a toliet plunger (yes a toliet plunger and try to move the obstruction). If this doesn't work than you will need to rent a plumbing snake and run a cable down the drain. These are all cheap and easy to do.

If that doesn't work, then you have a major fixl --- buy the pump and use this to drain the pool when you need to. $300 pump makes better sense than hiring a plumber / pool repair person.