Went to the pool store today (don't worry, I just went for skimmer socks) and decided to ask the girl if they sold liquid chlorine in bulk. She, of course, told me that I shouldn't be putting liquid chlorine in my pool because "it is 90% sodium" and will raise the TDS, which will require me to drain my pool... therefore I should be using pucks.
Don't worry, I know TDS is irrelevant and of no concern, and I'm not going to use pucks, but I like to argue so I started to tell her that I disagreed with her. I then realized that her "training" allowed her to spit out some technical terminology that made her sound credible (so people will buy their chemicals), so I just decided to pay for my skimmer socks and leave.
However, now I'm curious on the true makeup of liquid chlorine. The stuff I buy is 10% Sodium Hypochlorite and 90% "Other Ingredients". I highly doubt the other ingredients are mainly made up of salt, but if so, what harm is that to the pool, over time? Basically, I want to tell the pool girl that liquid chlorine doesn't harm the pool and won't raise the "TDS" or salt level so high that I will be forced to drain every year. Anyone have the technical reasons why, other than "TDS is irrelevant..."?