We just purchased an used spa and Dh is in the process of hooking it up. It sat for around 10 years not being used, before that it was only used around a year. It has always been inside the house. Question is, now what? What do I do to get it up and running for us? I don't want to use the store bought products, I am using your advice on my pool and now I want to do the same with this. Do I need to contaminate it? I have read some people talking about that, if so not sure how to go about that. It will hold around 300 gallons water.