I see you got it working! But ummm...you might have overshot your CYA by adding the 8 lbs a few days ago. At 60 you were in good shape, now at 90-100 you are very high.
Not the end of the world. CYA at high levels can be hard to read, and the test is hard enough already.
Next time you test, dilute the pool water ahead of time with the same amount of tap water. (50/50 mix), then use that for the CYA test. Multiply your result by 2. If your prior readings were actually 90-100, you would see the diluted test come in at around 50. If the two ways of doing it are wildly different, then we may have to coach you on how to better do the test. It can be frustrating.
Per the chart below, even if high CYA, make sure you keep the Cl level well up in the target range. You may have to periodically add liquid until you get your SWCG sorted out and producing enough to keep it at the levels in the chart.
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