1. Get a local OTO/phenol red drops kit, and test your pool.
2. Did you fill your pool with the same water you use in your house? Do you have a softener or other filter on your house water? What does the INSIDE of a toilet tank in your house look like?
3. Is this an Intex or other soft-side pool?
If you have a soft-side pool, read the Super Simple recipe -- it does not apply at this point, to your pool, but there's still a lot of relevant info there: http://pool9.net/ssr/
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