1.5 lbs Trisodium Phosphate (TSP).
Some homebrewers use this along with Oxiclean Versatile Free or another percarbonate based cleaner as a homebrew cleanser. The ratio I’ve read is 30% TSP and 70% Oxiclean, but I’ve never tried this myself.
10/1/17 6 PM Central: This is selling for just $3.96. That’s just 12 cents shy of the best historical direct from Amazon price I found. Shipping to most US addresses is also free, with a qualifying order, as part of the Amazon’s Add On promotion. Price, shipping and availability can change quickly. Check the product page for current price, description and availability. Also: Recent Amazon Finds and Amazon Fillers Resource Page
Reminder: Always read and follow manufacturer’s instructions. If you have a question about the suitability of any product for a particular application, contact the manufacturer.
Also Consider: Five Star PBW Cleaner (Powdered Brewery Wash), 4-Pound Jar
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Five Star PBW Cleaner at Amazon