What is added to water for high-level disinfection?

The correct answer is one-third cup of household bleach because this concentration is effective in achieving high-level disinfection while also being safe and manageable for use in most environments, including esthetics practice. High-level disinfection is crucial in eliminating a wide range of pathogens from surfaces and tools used in beauty services, ensuring the safety and health of both the esthetician and the clients.

Using this specific amount of bleach mixed with water achieves the necessary balance to ensure that it is potent enough to kill germs without being excessively strong, which could lead to potential damage to surfaces or pose health risks. It's essential for professionals in esthetics to maintain strict adherence to these guidelines to promote a safe and hygienic working environment.

Higher amounts, such as half a cup or one cup, could lead to unnecessary chemical exposure and risk, while quantities like two teaspoons may not provide sufficient disinfection. Thus, understanding the appropriate concentration is vital for effective and safe high-level disinfection practices.