We have an Intex 24x12x52 Ultra Frame Saltwater pool. Put a winter Aquapill in it and covered it in Oct. Uncovered it this past weekend - it is green. Not sure what order to do things like when to add water, when to hook up pump, what to do about the water, etc. We didn't have good luck last year with keeping it sparkly clean - seemed like we dealt with algae most of the summer. Where do we start?