What cost advantages keep calcium hypochlorite competitive in aquaculture disinfection?

What cost advantages keep calcium hypochlorite competitive in aquaculture disinfection?
In Chinese aquaculture, calcium hypochlorite remains a favored disinfectant primarily for its low cost. A standard 25 kg bag with 28-32% available chlorine sells around 20-30 yuan. Pond clearing costs roughly 13.5 yuan per mu, while water column disinfection runs about 1 yuan per mu. These figures undercut alternatives like potassium permanganate at 40 yuan per mu or bromochlorodimethylhydantoin at 1.98 yuan per mu for water treatment. However, efficacy drops sharply with rising pH and is temperature-dependent, requiring careful dosing. The product's affordability drives steady demand among price-sensitive fish farmers, even as pricier options like chlorine dioxide offer gentler profiles and broader pathogen control.