Ok, where to start, typical bleach is around 6% chlorine, and ranges up to around 12% in the form of "liquid Chlorine" sold in pool stores, I don't recall the exact % of chlorine available in a trichlor puck, but it seems like around 2/3s of it by weight. So when it comes to a simple matter of effective amount of chlorine per pound of product he has a point, of course he is wrong about a lot of the other stuff.
Now there are so many mistakes and half truths in the rest of his statement that it is hard to catch them all, but here go a few:
Trichlor pucks and dichlor (often sold as shock) both add CYA to the pool, with Trichlor it is roughly 1 part CYA raise for every 2 parts Chlorine, for dichlor it is closer to 1 to 1, the problem here being that anything over about 70-90ppm of CYA becomes unmaintainable, with a desired minimum of 40 ppm for most people.
He has things a bit backwards here, Cal-Hypo does not contain any CYA, its byproducts are Chlorine and Calcium which will raise your Calcium hardness, desired Calcium hardness depends on the type of pool surface you have, but in general it can start causing problems somewhere over 300 ppm.
Now about bleach breaking down and adding Sodium, he is right on that topic, but does not go on to say that acceptable level of Sodiium in water is much higher, people with Salt Water Generator chlorination systems add hundreds maybe even thousands of pounds of salt to their pools to get to the desired levels. Sodium does not become a problem in pools until well over 3,000 ppm, this means you can stand having 10 times as much byproduct of bleach as you can of Cal-Hypo, and close to 100 times what you can stand with dichlor or trichlor. I think his real problem is he can't compete with Wal-Mart on the price of bleach, plus he can't keep his chemicals straight confusing dichlor with cal-hypo.
Ike
p.s. all numbers I used were rough approximations, but should give the general idea
