Emergency Water Purifier

Bleach dosage calculator to purify emergency water. Survival tool based on WHO and CDC guidelines.

CRITICAL WARNING

This tool calculates doses for COMMON BLEACH (Sodium Hypochlorite 5-6%).

Never use bleach with fragrances, soaps, or labeled "No Splash". Only plain bleach suitable for disinfection.

Water Parameters

Water Condition
L

Recommended Dose

2 drops

~ 0.10 ml

Waiting Time

You must wait 30 minutes before drinking.

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Frequently Asked Questions

Can I use any type of bleach to purify water?

No. It must be bleach suitable for drinking water disinfection (labeled as such), without fragrances, dyes or detergents. The concentration of sodium hypochlorite is usually between 4% and 6%.

How long should I wait before drinking the water?

You must wait at least 30 minutes after adding the bleach. If the water is very cold or cloudy, it is recommended to double the waiting time to 60 minutes or double the dose if it cannot be filtered beforehand.

What do I do if the water smells strongly of chlorine?

A slight smell of chlorine is a sign that the disinfection has worked. If the smell is very strong, you can pour the water from one container to another several times (aeration) or let it sit uncovered for a few hours for the chlorine to evaporate.

Is it better to boil water or use bleach?

Boiling water (at least 1 minute of strong boiling) is the safest method, as it kills all pathogens. Bleach is an excellent alternative in emergency situations where making fire is not possible.

Emergency Water Purifier

Drop calculator: get the exact dose based on water volume and clarity.
Clear or warm water: 2 drops of bleach per liter (sodium hypochlorite 5-6%).
Cloudy or cold water: 4 drops per liter, filter first with cloth or coffee filter.
Waiting time: minimum 30 minutes before consuming.

# Water Purification in Emergencies

Access to drinking water is the number one priority in any survival or emergency situation. When boiling water is not a viable option, chemical disinfection with common household bleach (sodium hypochlorite) is an effective method endorsed by global organizations such as the WHO and CDC.This tool provides the exact and safe dose of chlorine needed to eliminate most harmful bacteria and viruses found in untreated water sources.
Important Notice: Unscented Bleach Only
Verify that your bleach contains between 5% and 6% sodium hypochlorite. Do NOT use scented bleach, "no-splash" bleach (gel), or bleach with added soap. These additives can be toxic if ingested.

# Steps to Purify Water with Bleach

  • Filter: If the water is cloudy, filter it through a clean cloth, towel or coffee filter. Organic matter reduces the effectiveness of chlorine.
  • Dose: Add the exact number of calculated drops. Shake or stir well to distribute the disinfectant throughout the volume.
  • Wait: Let the water rest for at least 30 minutes before drinking. It should have a faint smell of chlorine as confirmation.

# How Long Does Treated Water Last

If stored in a clean, closed container in a cool, dark place, treated water can last up to 6 months. It is recommended to label containers with the treatment date. For small quantities (1-5 liters), always use a dropper for precise measurement.

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