Washing old Eco Complete, safe?

Aquaken

AC Members
Aug 31, 2004
245
2
16
I've got some eco complete sitting in my closet in an old 20g that never had fish in it. It had a few plants (3?) for a while. My question is whether it is safe just to wash the dust off and add it to my existing 29g, which has mostly black gravel mixed with a little eco complete. Are there any special tips here?
 
do like water changes and rinse then transfer..
 
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