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I thought it was pretty clear... the product is not for GETTING your PH to 5.2 which is how many people use it... or think it's supposed to be used for. You are not going to dump in a measured amount of this stuff and magically have your PH reach 5.2.
From Five Star's product sheet for 5.2
5.2 is a proprietary blend of food-grade phosphate buffers (similar to brewer’s salts) that will lock in your mash and kettle water at a pH of 5.2 regardless of the starting pH of your water.
From morebeer.com's description of the product.
Never worry about pH again! One tablespoon of 5.2 per 5 gallon batch and your water is instantly adjusted to the perfect pH of 5.2, no matter what your starting pH was.