I recently bought a house with a Leisure Bay hot tub. The owners let the hot tub sit for several months uncared for and it has been filled with water. However the water is dirty, and I believe it has algae in it. I have not done anything to the hot tub yet or even turned it on because I'm not sure where to start or what to do first. Any tips for me on what I need to do to care for this hot tub properly?