I find having to drain half my water and refilling to lower CYA from too many pucks to be VERY un-economical.

Then you have to toss in the cost of all those boxes of Borax you need because the pucks make your pool too acid.

Then you have to buy tons of bleach or liquid chlorine anyway because the pucks raised the CYA so high that you couldn't use them to raise the FC high enough to compensate and now you have a big, fat algae bloom and you're going to have gallons and gallons of bleach every day to kill it.

But if you dilute 12.5% LC half and half with fresh water you may be getting 6% at a lower per gallon cost than even in the grocery stores. Nothing wrong with saving a few bucks! Why bother? Because at 12.5% LC is highly unstable and will break down into lower concentrations and you'll lose the edge. But if you dilute it yourself, you'll have 6% and that's got a lot longer shelf life--but you'll still want to keep it shaded and cool.