Sodium bisulphate is mainly used to correct water alkalinity levels.
It is also used in metal finishing, in product cleaning and, as already mentioned, to lower the water pH and to achieve effective chlorination in swimming pools and whirlpools. Sodium bisulphate is also approved by AAFCO as a feed additive in general, including pet food additives.
It is highly toxic to some echinoderms and is therefore used to control starfish outbreaks. But it’s relatively harmless to most other animal species.
In the textile industry it is successfully used to create “burnout velvet”. That is to weaken and flake the fibers based on cellulose leaving in the finished product burnt areas where it is possible to apply other colors/ designs usually with attractive motifs.
Sodium bisulphate is also the active ingredient in some granular poultry litter as it has proven effective in significantly reducing the concentration of Campylobacter and Salmonella in chicken coops.