Common household laundry
bleach (UN-scented), used to whiten and disinfect laundry
, is typically either 5.25 percent (“regular strength”) or 6 percent sodium hypochlorite (“ultra strength”).
Use ordinary household bleach (5.25% available chlorine).
For each gallon of clear water to be treated add five (5) to eight (8) drops of bleach. (about 1/8 teaspoon)
For muddy or mossy water use 15 to 20 drops of bleach per gallon of water.
Then stir well and allow to stand for thirty minutes. At the end of that time the water should have a slight chlorinous taste; if not, add more chlorine.
To use chlorine bleach for general surface area disinfection, use a fresh mixture of 1 – 3 tablespoons of household bleach with one gallon of cool water Apply to surfaces. Leave wet for 2 minutes, then rinse and air dry.
➥ Emergency Disinfection of Drinking Water | Safewater | Water | US EPA