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the tank. A system that releases one gallon per minute provides a constant to work with so the remaining variables would be the amount of KMn04 required to be mixed in the tank to detoxify an assumed amount of rotenone in the stream. A full 500 gallon tank filled with water would require 18.70 pounds of KMn04 in solution discharged at a rate of one gallon per minute to detoxify a liquid rotenone concentration with carrier of 2 ppm flowing in a stream containing 5 cfs. The feeder hose should be placed between the mixing tank and the bucket contain- ing the constant flow valve mechanism. No hose should be connected to the outlet pipe of the constant flow valve assembly since it can potentially in- fluence and possibly increase the rate of flow. In practice, the tank may not quite hold 500 gallons, the stream flow may be an estimate and there are always adjustments to be made in the field that an applicator must be prepared to compensate for. If a full 500 gallon tank is used with a discharge rate of one gallon per minute it would requ re refilling every 8.33 hours. Doubling the amount of KMin04 and adjusting the release to one gallon per two minutes would require refilling every 16.66 h04rs. If the KMn04 is in solution this approach would eliminate night time checks where small flows are involved. On larger streams where KMn04 rates are increased to a point where precipitation might be a problem a detoxification operator might be assigned to operate and observe the equipment. Twenty-six pounds of KMn04 per 100 gallons of water should go into solution, with agitation, when the temperature of the water is 500 F. A Fr8sh-flo aerator can be used when the tank is being filled to assist in getting the K~n04 in solution if the stream flow is such that maximum rates must be used. ~ b