Sodium hypochlorite is bleach.
Usaully when some one recommend SH they mean a stronger version then standard bleach more like pool shock(much stronger then bleach).
NaOCl Wt. %
Common Uses
2% Shock Chlorination of Wells
3-6% Household Disinfectant, Laundering Clothes, Dentistry Root Canal Treatment, Antisepsis of Mammary Glands in Dairy Industry, Disinfectant in Hospitals, Food Processing, Mushroom Production, Hog, Beef, and Poultry Productions, Maple Syrup Production, Fish Processing, etc.
12-16% Disinfectant in Swimming Pools, Water Treatment, Waste Water Treatment
Note: The higher the sodium hypochlorite strength, the faster the decomposition rate becomes. See Decomposition of Sodium Hypochlorite for more information.
Taken from
What is Sodium Hypochlorite (Bleach)?
What are we killing or sterilizing??