1:1 Set, 1x 2 oz Hydrochloric Acid 4-5%, 1x 2 oz Sodium Solution NaClO2 Water purification set consists of two components which are accorded to the guidelines of the drinking water regulations and compliant with the standards of the food industry Component A: 28% Sodium solution Component B: Activator, HCl 4-5%. This Kit is not intended for human consumption. 1 drop of each solution. Activated after 30 seconds, color change from colorless to ochre Use drinking water disinfectant with care. Always read the label and production information before use. Not marketed for internal use. For water treatment only. End use is sole responsibility of consumer. In 2010 the FDA issued a warning against using this product in a manner inconsistent with labeling and instructions.