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Old February 2, 2013, 03:54 PM   #2
math teacher
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Join Date: February 5, 2012
Location: Southwest WA Coast
Posts: 330
This question comes up a lot. I am still using powders I bought in the 60s. Powder can deteriorate over time. It depends a lot on how it has been stored. If it smells acrid or looks rusty, sprinkle it on your lawn.
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