1. Add borax till the pH is above 7. Once the pH is between 7 and 8, and the chlorine is above 3 ppm, the pool should be chemically and bacteriologically safe.
2. However, cloudy water is not safe from a swim-safety point of view. If you let them swim, you must NOT let them swim underwater, and an adult must maintain a continuous head count on the swimmers in the water! (That is what life guards do, if they can.)
3. If you have time -- and if the fill water is not too cold -- drain and refill. It takes a LONG time to clear Intex pools, even when you have the right test kit (you don't) and the right filter (Unicel cartridges). If you DO refill, follow the SSR => http://pool9.net/ssr/ The iron may stain things, but is NOT a hazard.
4. Ironically, calcium hypochlorite (Shock N Swim?) helps with iron removal. However, if you don't control calcium levels, you can end up with milky water as you have.
5. If at all possible, purchase a 6-way test kit at a nearby Walmart. Use this link to check stock: www.walmart.com/ip/17043668/
6. It's more likely that your cover deteriorate from sunlight, than from pool chemicals. *IF* pool chemicals are the problem, the cover will ALSO be bleached white on the side next to the pool.

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