The first questions I would have are what chemical was the 1" puck and are you sure the 3" puck is cal-hypo and not tri-chlor? Cal-hypo won't have CYA in it but tri-chlor will and you shouldn't put different types of chlorine in the same floater as there can be a bad reaction.
If you are using tri-chlor that will lower your pH as well. I would suggest getting the pH up above 7.2 as a low pH can cause damage to the liner. The Borax should dissolve quickly so you can check the level a couple hours after you put it in.
If you are using cal-hypo then you would need to add CYA also as the cal-hypo doesn't. In that case, you will probably have fewer problems if you use bleach (liquid chlorine). The cal hypo will add calcium which isn't a problem to vinyl liners but high levels could lead to cloudy water later on.
Peter
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