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I have access to 1000L ibc totes for free but they were used to hold def (diesel exhaust fluid). I know that it is urea and water. The msds does not list any other chemicals in it. Just wondering if the totes are ok to use.

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I'm new to AP and I don't know much about chemistry, but doing quick research about DEF on Wikipedia (yeah, I know) leads me to believe that it should be safe. DEF is apparently 32.5% urea and 67.5% water.  It's my understanding that urea is actually helpful in starting AP systems (see "peeponics").  I would check to see if the brand of DEF in your IBC totes have any other additives, but otherwise I would use them.

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