Just be very, very careful.

Clorox is doing a LOT of 'brand' and 'product' "differentiation" by adding 'goop' to their products. It's very hard to find plain Clorox bleach, and much of what you can find is 6%, not 8.25%.

And unfortunately, virtually everything Costco sells for pools -- except plain A & H bagged baking soda -- is a BAD idea. By contrast, the trichlor and dichlor Sams Club sells are plain, pure, and a great price. The Clorox bleach at Sams is, unfortunately, still Clorox bleach