SW Pool opening/green/no vacuum

Jul 5, 2015
Birmingham, AL
All winter my pool was uncovered and stayed clear without the pumps. The moment I turned my pump & SWG on its turned GREEN & cloudy! I need recommendations on what to do.. The threads about "slamming" are they ok to do with a SW pool? The pumps seem to be working fine. I don't have a pool vacuum, the intex pool I have doesn't have availability to hook up a vacuum to the "skimmer/pump". Im gonna take a sample to the pool store to get it checked but what are the best websites to buy pool chemicals safe for SW pools??
I'm wondering if I should just go ahead and drain it and start all over. Help!