If you truly have no CYA, and it was sunny today, your chlorine would have been all gone by the end of the day. If it was not, you almost certainly have very high CYA levels. If you can get an HTH 6-way from a local Walmart, do so. It has the Taylor CYA test. If not, check your chlorine in the AM. It it's unchanged, and you haven't added additional chlorine . . . then your stabilizer is VERY high.
I'm reluctant to tell you what to do, when I don't know what your levels are. Your pH reading may be accurate IF the CYA is high, but if the CYA=0, then the pH reading is bogus. Chlorine that high messes up phenol red, unless LOTS of stabilizer is present.
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