Hi. I have a 40k gallon, in-ground pool with vinyl siding and a DE filter. I usually add 6 to 12 grams of granular chlorine daily, depending on temperature, recent or upcoming rain, etc. For awhile I have been under the impression that chlorine tablets where simply an alternative to granular chlorine, but I did not like the idea of using them because I felt I would have less control over the chlorine levels than with granular.

Recently I was told that the correct use of tablets is to keep chlorine levels steady over the course of the day, and to act as a 'supplement' to granular so less can be used.

I was hoping someone here could clarify the matter for me, and perhaps give me some tips on how often I should be adding granular to a pool of this size were I to go with the tablet-supplement course of action?

Thanks!