Hi Cooper,
I figure 13,500, but for your chem figuring, it doesn't matter. If you have no CYA, and your pH is reasonable, there's no reason not to use your in-line feeder, if you have tri-chlor tabs left over I wouldn't necessarily go buy them, but they will add CYA to your water albeit slowly, and will add a constant stream of chlorine as well.
BUT.............As we always say, you need to test.
If you want to use up your tri-chlor tablets, you should check your FC and pH level daily, and if it gets around 7.2, add about 1/2 box of Borax to raise pH. Meanwhile weekly check your CYA level and when it hits your target, turn off the CL200. IF used correctly (and until you are comfortable with the B-B-B method, that's a big "IF") , Tri-Chlor tabs can be convenient. However, never use "Double-Acting" tablets or any that say they have copper or "Extra Algaecide".
Alternatively, you can safely use bleach/LC and add CYA via your skimmer, or, by putting it in a sock or stocking and hanging it in the return stream. It's always safe to use Bleach, Borax, Baking Soda, Muriatic Acid and CYA as your total pool care chemical supplies. Used correctly, you'll need nothing else.
Carl
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