<<does anyone know if using bleach (I doubt it) or TSP are okay in a certified organic operation? >> The Calif. Certified Organic Farmers have these postings on "bleach" R[egulated] (on the final food, seems like seeds might not be a problem)- Bleach. Includes calcium hypochlorite, sodium hypochlorite and chlorine dioxide. Allowed as a sanitizer on food contact surfaces. Wash water treated with chlorine compounds as a disinfectant cannot exceed the Maximum Residual Disinfectant Limit under the Safe Drinking Water Act, currently 4 mg/L (residual) expressed as Cl2. A[llowed] - Hydrogen peroxide 3. Section 4 - Crop Standards ... Sanitizers and disinfectants used must comply with the standards in Section 8 (see §8.3.1 for Crop Materials and §8.3.3 for Processing and Handling Materials). Chlorine bleach may be used to ... Hope this helps Gareth the Chlorine ChileKnight