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You're forgetting something besides the pekacid.... The potassium oxide. You need to purchase that separately. It's pretty cheap for a 50lb bag

You are absolutely right, it's an ortho not a polyphosphate. Boys, thanks for the info. I just want to point out that the actual molecules used in drip clean are listed in this safety sheet Won't let me post link. Google it's safety sheet. It says Phosphoric Acid* (CAS Number: 7664-38-2)...