Why convert? Why not use both!
I have found that using both is the easiest way to maintain the pool. Trichlor adss chlorine, CYA and lowers the pH. Bleach adds chlorine, and raises the pH. If you use both you tend not to have any need to adjust pH as they tend to balance each other out. If pH starts dropping use more bleach, if pH starts going up use more trichlor.
As for the CYA I find it also stays fairly constant using this method as you loose CYA over time from things like backwashing, splashing, etc... and also gain CYA-free water from rain dillution.
Don't mix trichlor and bleach together. I use trichlor in a feeder on the pump discharge and then manual add bleach as needed into the deep end of the pool.
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