I'll try to respond more, tomorrow.

But two points:

Unless the 10% bleach is being MANUFACTURED in Hawaii, it's VERY unlikely that your 10% bleach contains 10% bleach. To do so, it would have to be either (a) high purity bleach, OR (b) refrigerated on the boat from the mainland, OR (c) brought in air freight. (A) is possible but uncommon; (B) & (C) are almost certainly not true.

The reason: regular bleach, above 7%, breaks down pretty quickly at hot temperatures, with rate dependent on concentration, metal content (iron & nickel), and temperature. 15% bleach can go to 7.5% in a week at temps above 90 degrees.

Secondly, commercial pool chlorine loss is often mostly a function of how many sweaty, oily bodies go into the pool per day. This chlorine demand is somewhat independent of gallons.