You can use your Pool Math app to provide you a comparative price based on % Chlorine being purchased.I haven't cracked the math on it but home depot sells boxes of 3 gallon jugs, for 12.99 I think. So far I have been buying from them.
I may not be aware of something with your equipment, but just in case, chlorinator, one I have least, is one where water passes through it non stop. So unless you have some bypass installed to circumvent the chlorinator, water will continue to run through, and any chlorine tabs inside, will continue to be dissolved.
My chlorinator looks like this...piping going in one end, coming out the other. Only way to stop chlorination, is to open the top, remove the remainder of chlorine tabs, then close the lid back again. In pic below, it's the front round black cap, with silver handle, handle moves from setting 1 to 6.
If you don't have bypass then you likely need to do same.
View attachment 171951
Ciaka, that is a salt system chlorinator not one that uses pucks. Did yours have pucks inside?
My mistake, had it confused with a different system. Now I see it's in the signature.The chlorinator I have, and one I posted pic of, is a trichlor puck system, plus mineral feeder. I removed the mineral cartridge though, only using trichlor pucks until my cya rises up to about 35-40 ppm. Them all pucks will be removed in favor of liquid chlorine.