Chlorine is used for surface disinfection. it is used to sterilize silkworm eggs from any nosema spores. For feeding bees to control nosema, Not sure. There is one study on acidified food and Nosema infection, Please check this paper <http://www.apimondia.org/apiacta/slovenia/en/forsgren.pdf> Medhat Medhat Nasr, Ph. D. Provincial Apiculturist Crop Diversification Centre North 17507 Fort Road Edmonton, AB, Canada T5Y 6H3 Tel: (780) 415-2314 Fax: (780) 422-6096 Mailto:[log in to unmask] ****************************************************** * Full guidelines for BEE-L posting are at: * * http://www.honeybeeworld.com/bee-l/guidelines.htm * ******************************************************