What can you do to clear up green water in your pool if your chemicals are good but do not work?
Try 24 hr filter cycle and more chlorine. And clean the filter frequently.
you can add them in any order but DO NOT mix the chemicals they can cause fires the best bet is to test the water see what you need and add it to the pool one at a time then retest you may have to add chemicals several times in the first week or two until you get enough of a build up to sustain a clear safe pool. good luck
Take a water sample to your local pool store, and let them test it. I do this every year and they tell me exactly what chemicals I need. I buy them, usually about 100 bucks, put them in, and in a day its clear and beautiful. Its worth the 100 bucks to avoid irritation, and expense, of trial and error. Good luck!