Mold and Mildew Test

The tap water sample containing the copper penny that we began testing on Mar 1st, is showing some discoloration of the filament just above the water line. There is a half-dollar size, slimy, circular pattern of mold on the  water surface, surrounding the filament.  

The 3% hydrogen peroxide samples continue to look pristine, with no signs of filament discoloration since we began testing on Feb 3rd (7.5 weeks) at 99% RH. We are declaring peroxide the clear winner in this testing and will be recommending going forward. 
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