You can use the same chlorinator after thoroughly cleaning the old one. Your method of flushing should be fine. I don't know of a 3" calcium hypo tab. Do keep an eye on your stabilizer level if you switch to trichlor, they add stabilizer and you may have to run higher chlorine levels as your stabilizer level increases. Trichlor is also going to drive your pH down as well. Most of us on the board love plain old bleach for chlorination, it only adds sodium to the pool.
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