No, Crystal Blue Black Out is safe for fish, animals, recreation, irrigation, but it is not safe for potable water.
Crystal Blue Black Out does not kill anything. It is used as a pond colorant only.
Crystal Blue Black Out is a pond colorant only, it will not clean or clear pond water. CAL FLO Liquid Limestone is labeled for use in ponds at a rate of 2 1/2 gallons per surface acre of water. If commercial spray equipment is used, add one gallon of CAL FLO to 30 gallons of water and project the dilution on to the water to be treated. If CAL FLO is applied from a boat, slowly pour CAL FLO from a moving boat, letting the motor serve as a mixer.