What scenarios are bactericides and algaecides primarily used to address?

Bactericides and algaecides are chemical agents that can inhibit or kill microorganisms such as bacteria, fungi, and algae in water, preventing excessive microbial growth and harm. Their core function is to maintain water cleanliness and system stability. Its applications are wide-ranging, mainly concentrated in areas where "the growth of microorganisms in aquatic bodies needs to be controlled": Industrial circulating water systems (such as cooling circulating water in power plants and chemical plants) are the core scenario. Circulating water is in a high-temperature, nutrient-rich environment for a long time, which easily breeds algae (such as green algae and blue-green algae) and bacteria (such as iron bacteria and sulfate-reducing bacteria), leading to pipe blockage, reduced heat exchange efficiency, and even equipment corrosion. Bactericides and algaecides can be added regularly to inhibit the reproduction of microorganisms and ensure the efficient operation of the system. In the field of aquaculture, low-toxicity bactericides and algaecides (such as chlorine dioxide and potassium persulfate compound salt) are needed to control harmful bacteria (such as Vibrio and Edwardsiella) and excessive algae in aquaculture water, and to prevent fish and shrimp from being infected with diseases or from water hypoxia due to mass algae deaths. In addition, bactericides and algaecides can also play a role in landscape water bodies (such as artificial lakes and fountains), swimming pool water, and industrial wastewater pretreatment. For example, after being added to landscape water bodies, it can prevent algal blooms, and after use, it can ensure that the water quality meets hygiene standards and prevent human infection with pathogens.