How do you refill a aqua smarte bac pac?

Cut part of the top off of the pac and refill with 1" or 3" (if you can get them to fit) chlorine tab's. I was able to get about 4 of the 3" tabs into mine, they seem to be cheaper than the 1" tabs. I do not know if this effects the efficiency of the dispensing system or not but It seems to be working for me. My neighbor does the same thing with his pool.