I have a SWG, but I always keep about 3 refillable jugs of 12% Cl in the cupboard for tweaking and shocking. Before last winter close I dumped what I had remaining into the water so I had to replenish the stock. I was taking my son to a practice and ran out to a close by pool store to get a fill.
I was educated by a very irate and impassioned sales person that they never have (and never would) sell liquid Cl. They use granular. They pour them in front of a jet, and sweep them around if needed to dissolve, and a little light shines down from the heavens to illuminate the area where granular was added.
- a> they buy granular in bulk so it is cheaper for me
b> Cl is far too dangerous to handle
c> there is SO much work to use liquid of diluting and pouring to use it safely
d> granular requires no work and once you train it, will get you a beer as you add it
Which launched a story about how they have SOOO many clients who they go to and there is no pattern left on the liner because they pour in the liquid - "It's heavier then water you know? It sinks right to the bottom and will eat the liner"... and I think a hole through the bedrock to the middle of the earth. (hey - that might help with my pool heating...).
I didn't argue, I just thanked her and left the store.