Biguanide is a compound that dissolves in water to give highly basic solution. These solutions slowly hydrolyse to form ammonia and urea.

Disinfectants such as chlorhexidine and polyaminopropyl biguanide contain biguanide

Occasionally found in drinking-water at very low concentrations. However, there are occasions on which large spills of cyanide, associated with industry, occur, and these can give rise to very high concentrations in drinking-water source waters, particularly surface waters.

Peracetic acid is an antimicrobial for use on hard surfaces. Use sites include agricultural premises, food establishments, medical facilities, and home bathrooms.

Exposure to peracetic acid can cause irritation to the skin, eyes and respiratory system and higher or long-term exposure can cause permanent lung damage.