I realize this is a late reply but I agree with keeping any left over pucks you have (is this what you were asking?) I switched to BBB after getting my CYA level where I wanted it but I just went through a "cloudiness" period - did several shocks and backwashing of the filter. Because I had to add water after backwashing I was glad to have 3" pucks left over to reload the autochlorinator in order to increase my CYA back to where it needed to be.

I'd also agree with using up any pucks already in a floater if for nothing other than safety reasons.