Bel-art f17093-0000 cleanware aqua-clear water conditioner, 100ml bottle protects water baths and other water systems against the growth of algae, bacteria, molds and biofilms. Protects pumps and thermostats and helps prevent tubing from clogging. Also permits longer use of water used in developer for color or x-ray films and will not harm film. Just 2ml per liter of water adds a blue tint which will fade after about 3 months reminding you to change the water and add new conditioner. Can be added to the water inserted in the water jackets of co2 and regular incubators. Does not contain any substance listed by california’s safe drinking water and toxic enforcement act of 1986 (proposition 65).