Do you need to add stabilizer to your pool? Once you add CYA (stabilizer/conditioner) you cannot take it out easily. Too much and your pool becomes a big green monster that is very hard to control.
Do you have any test results?
What are the products that make up the other 37% of that tablet?
wantboost is probably talking about trichlor tablets, which contain stabilized chlorine. Most trichlor tablets are 98+% trichlor and 90% available chlorine, but there are a few brands that use lower percentages (by adding fillers or other chemicals which provide "extra features").
It is also remotely possible that one of them is cal-hypo instead. Cal-hypo comes at various strengths, with 63% being a very plausible strength.
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