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Is it safe to use the Phosphoric Acid Barrels from a large soda bottler to make a composter? Answered

These are barrels I got when I requested Soda Syrup Barrels, directly from the bottling plant.  They still contain a small amount of liquid.  The barrels are white and have a label that says CRI-1020787, Corrosive, 8, Phosphoric Acid Solution, UN 1805, along with a bar code. There is no mention of percentage on the label.  I assume they are food grade.  I need to know if they are safe to use to make a composter.  Please let me know, what you know.

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Johenix (author)2010-01-11

Rinse and spray the rinse water on your garden for fertilizer.

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lemonie (author)2009-12-30

Rinse and you'll be fine. Phosphate is not harmful to compost, but excessive acid isn't going to help.

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NachoMahma (author)2009-12-29

.  Do a triple rinse and you will be good to go. Phosphoric acid is pretty soluble in water (548 g/100 mL), so a good double rinse will probably do the job.

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