One ml of CDS Solution equal to three drops of WPS (1 ml CDS=3 drops WPS ). 1 ML of CDS is about 25 drops of CDS. Our CDS is made at 3000ppm as recommended. You do not need to activate it. Simply add your desired amount of ML or drops to water. CDS solution should be kept in refrigerator once it is open to ensure it’s effectiveness. All CDS and MMS Solutions are sold by for Water Purification, as recommended by agencies such as FDA.