I just drop clorox pucks in my toilet tank. These: http://www.meijer.com/assets/product...6324_A_400.jpg They last a month or two each. Your bleach smell was probably from the bleach reacting with urine. A detailed explanation of that specific reaction by chem geek can be found here: http://www.physicsforums.com/showpos...0&postcount=25 Although that thread was on the subject of using concentrated chlorine to clean up urine. The concentration released into and diluted by your toilet water will be much lower.