I am a Real Diaper Circle Leader with the Real Diaper Association (a not-for-profit organization). I lead the Ventura County chapter here locally where I donate my time to teach cloth diapering 101 classes as well as support the local cloth diapering community with monthly meetings which are all free to the public. The cloth diapering community has run into a bit of controversy regarding the use of Tea Tree Oil to kill microbes including bacteria commonly found in feces, yeast, viruses shed in feces and in rare cases, mold (usually related to improper storage).
Many moms have been recommending a few drops of TTO when laundering diapers. This has been disputed, suggesting that such a dilution can cause bacteria resistance and growth of superbacteria.