I bought 12.5 liquid chlor in 5gal container for 16.99 to do my baqua-chlor. conversion. That equates to a price of about 1.69/gal for store bleach. I've read on this forum that 12.5% will degrade faster than 6%. What is the likelihood that the pool store containers have been around a long time? Some of the labels look old. If so, it's probably not such a good deal. Is there anyway to tell? I get it from Namco. They used to 1/2 price their chemicals at years end to clear them out. They no longer do that. So..... it seems the liquid chlor may have an even better chance to get old.