The combined treatment is added, for example, to cooling water systems, paper and pulp mill systems, pools, ponds, lagoons, {TAIL ~ lakes}, etc., to control {HEAD ~ the formation} of bacterial microorganisms, which may be contained by, or which may become entrained in, the system to be treated 
The combined treatment is added , for example , to cooling water systems , paper and pulp mill systems , pools , ponds , lagoons , { TAIL ~ lakes } , etc . , to control { HEAD ~ the formation } of bacterial microorganisms , which may be contained by , or which may become entrained in , the system to be treated
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