Um, I don't see what the problem is. You threw in bags of...cal-hypo or di-chlor and it protected your pool over the winter. Did you test your water in the spring? If the #s were acceptable why change?

BBB is a way of thinking more than a set of rigid rules. There's a time and a place for Di-Chlor, Cal-Hypo and Tri-Chlor, as well as bleach.