I'm using the scoop end.
My test kits says to use 2 scoops and if it doesn't stay pink, add more.
I have to keep my chlorine high b/c of a high CYA. I think I may work on doing more of a drain and refill, but since I'm moving this summer I haven't made up my mind. We brought out CYA down a good bit over the winter months by doing several drain and refills. We are 100-120 now.
Yesterday was the first time I had to use more than 2 scoops, but I had shocked the pool the day before.