You've GOT to test chlorine levels, and report results. Go to Walmart and get some stabilizer (cyanuric acid) and an OTO / phenol red test kit. Do NOT buy any of their other pool chemicals -- they are a MESS. Instead, go to the detergent section and get a box of borax and at least 8 gallons of PLAIN 6% household bleach.
When you get back, add a gallon of bleach -- pump ON! -- and then test after an hour. If the chlorine is not above 3ppm (medium yellow), add another gallon. Meanwhile, put 2# of stabilizer in an old sock, and hang it in front of the return.
Keep dosing with chlorine till you see chlorine levels ABOVE 3 ppm. Depending on how slimy your pool is, it may take a lot.
One of the key rules of pool care is that it takes more, MUCH MORE money, time and chemicals to clean up a pool, than it does to maintain it.
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