Bleaching Powder (Calcium Hypochlorite) is a white powder, usually stronger (30-65%), and stores well if kept dry. Liquid Bleach (Sodium Hypochlorite) is a yellowish liquid, usually weaker (5-12%), and easier to mix but loses strength faster over time.

Store them in a cool, dark, and dry place. Sunlight and heat degrade chlorine very quickly. Always keep the lid tightly closed and out of reach of children. Do not store near metal tools as vapors can cause rusting.

Yes. Liquid bleach degrades relatively quickly; after 6 months to a year, it may lose significant potency. Powder lasts longer but must be kept perfectly dry. Always check the manufacturing date before use.

Yes. It is corrosive. The dust can irritate your lungs, eyes, and skin. Always wear gloves, eye protection, and a mask if possible when handling the dry powder. If it touches skin, wash immediately.

Minimum requirements are rubber gloves and safety glasses (goggles). It is also recommended to wear an apron to protect clothes and work in a well-ventilated area to avoid inhaling fumes.

You must wait at least 30 minutes after adding the chlorine. This is known as “contact time.” It allows the chemical enough time to effectively kill bacteria and viruses.

A slight chlorine smell is good—it means the water is safe. If the smell is very strong, you may have overdosed it. Let the water sit exposed to air for a few hours; the chlorine taste will naturally fade.

Yes. When dosed correctly (0.2 – 0.5 mg/L residual), chlorinated water is safe for all ages. It is significantly safer than drinking untreated water which may contain deadly pathogens like E. coli or Cholera.

No, not directly. Dirt and organic matter absorb chlorine, neutralizing it before it kills germs. You must filter the water through a cloth or let the sediment settle first, then treat only the clear water.

Boiling is excellent but consumes fuel and has no residual effect (water can get re-contaminated). Chlorination is cheaper for large amounts and keeps water safe during storage. For best results, filter then chlorinate.

NEVER. Mixing chlorine bleach with ammonia or acids (like toilet cleaners, vinegar, or lemon juice) produces toxic chloramine or chlorine gas, which can be deadly. Only mix bleach with water.

For general floor cleaning, yes, but never for food surfaces or water purification. These products contain additives that leave unsafe residues. For food prep areas, use plain bleach and rinse well.

Yes, especially if the surface touches food or skin. After letting the bleach solution sit for 10 minutes to kill germs, rinse the area with clean water to prevent chemical irritation or contamination.

It can. Chlorine is corrosive and can damage wood, some metals, and porous stone. It can also discolor fabrics (carpets/rugs). Always test a small hidden area first and use the correct dilution ratio.

A common ratio for non-porous surfaces is roughly 1 tablespoon of bleach per gallon (3.8L) of water. For heavier soils or bathroom disinfection, a stronger solution (1/2 cup per gallon) may be used.

Shock chlorination is a one-time treatment using a very high dose of chlorine (50-200 ppm) to sanitize wells, springs, or tanks after construction, flooding, or long periods of disuse. The water is NOT drinkable during this process.

It is generally recommended to clean and disinfect water storage tanks at least once or twice a year, or immediately if the tank has been opened for repairs or sediment has accumulated.

Yes, but you must first pump out the dirty floodwater. Once the water runs clear, you can perform shock chlorination. Test the water for bacteria after the chlorine has completely flushed out before drinking.

Significantly. Chlorine binds with organic matter (leaves, algae, waste) instead of killing germs. If a tank or well is dirty, you must physically scrub and remove the sludge before adding chlorine for it to work.

For drinking water, use a Free Chlorine Tester (strips or digital) to ensure a residual of 0.2-0.5 mg/L. For bacteriological safety, you need a lab test (like a P/A test) to confirm the absence of Coliform bacteria.