Ignore that dumb book*. It's wrong! That nutty thing was one of the reasons I started making my own kits (and still would be, if I was a better business man).

I ran a 300,000 gallon public pool with hundreds of swimmers, on straight industrial 15% bleach for THREE years, and never used a single bit of acid!

-- You can use the ABD tables, if you like --

*There is a reason why the book says what it does, and there's a reason why it's wrong in practice but the explanation runs to very long.