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[APD] 8 year old Trace element mix

A friend gave me an unused trace element in powder form that he purchased from Homegrown Hydroponics way back in 1999. This is the #6 stuff from http://www.hydroponics.com/info/aquatics/pmdd.htm , ie:
 #6 Chelate Trace element (Fe 7%, B 1.3%, Mn 2%, Zn 0.4%, Cu 0.1%, Mo 0.06%)

Since the mix is already 8 years, can I safely use that stuff to fertilize my aquatic plants?


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