Try and stay as close to shock level as you can. Instead of running another overnight test tonight, bring it to shock level after the sun sets and test again in the morning.
You can save the tablets for vacations and anytime you need to raise the CYA a little. As long as they are kept in a dry, airtight container they will last for years.
If your CYA level is below 50 you can use them for awhile. Or you can save them to use for vacations if you go out of town. If you are trying to maintain shock level it's better to just use liquid chlorine.
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