What have you been using to chlorinate with? Any other pool stores that you can ask to test it for you or does the pool store sell a kit that will test CYA and then you can do it yourself? We really do need that CYA reading to really know what to advise you, but in the meantime, go ahead and take the chlorine to 12 and try and hold it there. Test 3x a day and each time, take the chlorine back up to 12. If you tell me that you've been chlorinating with trichlor tabs, then I'm gonna say that you can take it up to 15 because my guess would be that your CYA is probably pretty high. Try and see if you can get that reading for us.
By the way, your wife is pretty smart for sending you here!
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