To control algae and algae slimes, use "Bardac" LF Low Foam Water Treatment Microbiocide as directed. For best results, slug feed. The frequency of addition of microbiocide needed depends on many factors. 1. Initially use 16 fl oz per 1000 gal of water to be treated (60 ppm active quaternary). Should the above dosage not give satisfactory results, use 21 fl oz per 1000 gal of water. 2. When the above treatment level is successful, use 6-9 fl oz per 1000 gal of water to maximize efficiency. Repeat weekly as needed. Should slime develop again, return to initial dosage. Cooling tower waters that are inherently low in algae growth may be adequately controlled by the lower range of these dosages; slug feed every 7 days.