Jrisebo

I have been popping off the top and putting 1" tablets in the frog cartridge. It works good, but so much wasted space, I was hoping a granular option was available. The 1" tablets work good, just a bit of a menace to refill.

What chlorine granules do you guys use? Hot tup takes the frog cartridge but I pop them open and put tablets inside. Want to get granules instead. Seem all are fast dissolving