Carl is right of course but an inline chlorinator can be a very handy item.
Because my CYA droppped to near zero over the winter/spring I've been using tri-chlor in my inline chlorinator since the first of June. Regular heavy rain since then has continued to dilute my pool water so I'll probably be able to use tri-chlor through mid-August or even later before my CYA gets back to where I want it (30-40 ppm).
So long as my water needs the additional CYA, I find using tri-chlor preferable to bleach. I don't have to add bleach every day or two and the tri-chlor helps keep my constantly rising pH in check.
Two other advantage of an inline chlorinator: (1) Tri-chlor is actually a cheaper chlorine source than bleach; (2) a chlorinator also lets you go on vacation without having to have someone add bleach to your pool while your gone.
Bottom line for me: Bleach is my primary chlorine source because it does the primary job with the least side effects but trichlor and an inline chlorinator have their time and place.
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