It may be desirable to dissolve them in a small amount of water to form a calculated concentration prior to use. Cakes have been designed to provide optimum dissolution rates in large systems. Cakes are sealed in a water soluble film for ease of use. Photo degradation takes place in sunlight and varies from 2 to 5 days. Industrial Red is significantly less resistant to photodegradation.
Chlorine speeds the degradation for all of the dyes .
Divide the known volume in cubic feet of a tank or impoundment by 0.1337 to determine gallons.