In your PM app there is a selection in the pull down menu called Bleach $ Calculator. This adjusts the price based on % strength & volume.Just left Home Depot. Bought HDX LC. I’m kicking myself in the butt for how much I purchased 8 gallons over the weekend at a mom and pop pool store. Just irks me how much they are gouging customers for LC. I bought 2 gallons at HD 10% strength for $9 with tax and the pool store sells them for double. Ughh lesson learned stop shopping at pool stores.
Just plug in the total price (I use $ including tax), the amount you purchase it in i.e. 4 gals and the % strength. It gives a cost per oz ($/oz) so then just pick the lowest unit cost and that helps sorting out 10% vs 12.5% and buying 3 gals vs 4 gal packs, etc.