Most SWCG manuals give a suggested CYA level that is higher than we recommend for most pools. So, make sure your CYA level is checked before you begin with the trichlor tabs. It may be that your CYA level is high enough already that it wouldn't be a good idea to use any more of the tabs.
The test kit that Dave encouraged you to buy (and I agree!) can be found in the link in my signature. (Until your registration is completed, I don't think you'll be able to follow the link he provided.)
Also, read the Best Guess Chlorine Chart in my signature below as it will help you understand the connection between CYA and needed chlorine levels.
Welcome to the Pool Forum!

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