Mixing and usage instructions do vary., and makes it confusing to me. The B&P you use calls for 6 ounces per gallon. Kosmo's Moisture Magic calls for: Injecting: Mix 1/8 cup of Kosmo’s Moisture Magic (BBQ Phosphate) to 1 cup of distilled water. (1 oz product to 12.5 lb. of meat). I have not looked at amounts of Butcher's BBQ or other folks selling phosphates.Ph’s aside they are all basically the same and do not readily mix with salts in powder form. This is what I use.
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I like the 0.3% to 0.5% range that AmesPhos recommends as it's easier for me to dial in the amount a little closer.