A concentration of from 5 to 10 parts per million "Arquad"{ S or "Arquad" S-2C provides kill with no tolerance build-up. The same products used in a concentration of 10 to 20 parts per million provide kill on fungi.. The pseudomonas organisms are, in general, highly resistant to most bactericides, and are among the most difficult organisms to control in industrial water systems. the most effective agent found against the pseudomonas organisms is a combination of "Arquad" S and Duomeen C. An initial application of 50 ppm of "Arquad" S is recommended in most cases. This quantity should be sufficiently large to kill any algae or slime producing bacteria in the system. Following the initial slug treatment, the quaternary content should be reduced to 10 ppm for continuous operation. Since the action of the "Arquad" is to surround and, in effect, smother the growth, no resistance can be built up, and thus the "Arquad" does not lose its effectiveness.
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