I bought a house with a pool, and the pool guy I had almost completely drained my pool. He was trying to drain half to get cya down. He also forgot to turn off the pump but thankfully I remembered and saved the pump from running dry. This guy is a total flake and took my clean pool and turned it into an algae ridden swamp. There is maybe half a foot of water in the deep end and it's pretty nasty and the connected spa is full. I have read through pool school and didn't find an article on how to start with an empty pool. I have the taylor k-2006 test kit and I'm extra motivated to do this myself. Where should I start? Should I drain the tiny bit of nasty water left? I know a trip to to the pool store is in my future to get cya, liquid chlorine, etc. Any help greatly appreciated.