Aqua-Clear™ Water Conditioner stabilizes water in water baths and other water systems. Just 2mL per liter of water provides long lasting protection against the growth of algae, bacteria and molds which often contaminate standing water. It also protects pumps and thermostats and helps prevent tubing from clogging. In addition, it may be added to water used in developer for color or X-ray films. It will not harm the film and permits longer use of the same solution. Aqua-Clear™ Water Conditioner adds a blue tint to the water which will fade after about 3 months reminding you to change the water and add new conditioner. 100mL polyethylene bottle with cap.