Re-using coco+perlite

Hey everyone, I am just finishing my first grow in coco coir. I know I can reuse my medium, but I was wondering if I NEED to use an enzyme for the old roots? I was thinking of dumping my pots into a large plastic bin, pulling out all the roots by hand, and then just flushing the medium until the TDS/EC is the same as my tap water. Would this cause any issues with my next grow? I just don't want to waste a lot of money on enzymes or deal with disposing of the coco.
 
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