Photo: Anna Shvets

How much bleach Do I need to purify 50 gallons?

1.5 cups To disinfect your 50 gallon hot water heater requires 1.5 cups of bleach left in the tank for two hours or 3/4 cup of bleach left overnight. For a 30 gallon tank, cut the amount in half. Keep in mind that a bit too much usually doesn't hurt anything.

purewaterproducts.com - Chlorine Amounts Necessary for Disinfection - Pure Water Products

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Chlorine Amounts Necessary for Disinfection

The table below addresses the quantities of chlorine needed to disinfect tanks and reservoirs, but it can be generalized and adapted to standard residential situations. Regular supermarket grade bleach contains 5.25% chlorine. Basic chlorine pellets used in dry pellet chlorinators are around 70% to 75% calcium hypochlorite. Example of a practical application. To disinfect your 50 gallon hot water heater requires 1.5 cups of bleach left in the tank for two hours or 3/4 cup of bleach left overnight. For a 30 gallon tank, cut the amount in half. Keep in mind that a bit too much usually doesn't hurt anything. A plumber we know regularly uses a gallon of bleach for a standard hot water heater. AMOUNT OF CHLORINE NECESSARY FOR DOSAGE AND TIME COMBINATIONS Volume of Box, Basin, Reservoir or Cistern 5.25% Sodium Hypochlorite (Bleach) 65% Calcium Hypochlorite 100 ppm* for 2 hours 50 ppm* for 8 hours 25 ppm* for 24 hours 100 ppm* for 2 hours 50 ppm* for 8 hours 25 ppm* for 24 hours 50 gal 1½ cups 3/4 cup 3/8 cup - - - - - - 100 gal 3 cups 1½ 3/4 cup - - - - - - 200 gal 6 cups 3 cups 1½ cups - - - - - - 500 gal 1 gal 7½ cups 3 3/4 cups 9½ oz - - - - 1,000 gal 2 gals 1 gal 7½ cups 1 lb 3 oz 9½ oz - - 2,000 gal 4 gals 2 gals 1 gal 2 lb 6 oz 1 lb 3 oz 9½ oz 5,000 gal - - 5 gals 2½ gals 6 lbs 3 lbs 1 lb 8 oz 10,000 gal - - - - 5 gals 12 lbs 6 lbs 3 lbs 20,000 gal - - - - - - 24 lbs 12 lbs 6 lbs 50,000 gal - - - - - - 60 lbs 30 lbs 15 lbs 100,000 gal - - - - - - 120 lbs 60 lbs 30 lbs

* ppm = parts per million

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How much bleach do I add to water for storage?

Sanitize the container with a solution made by mixing 1 teaspoon of unscented liquid household chlorine bleach in 1 quart of water. Use bleach that contains 5%–9% sodium hypochlorite. Cover the container tightly and shake it well.

cdc.gov - Creating and Storing an Emergency Water Supply - CDC

Choosing a Container

When storing safe water (water that has been treated to make it safe to use), it is best to use food-grade water storage containers, which do not transfer toxic substances into the water they are holding. FDA-approved food-grade storage containers can be found at surplus or camping supply stores. Contact the manufacturer if you are not sure if a storage container is food grade. If you are not able to use a food-grade water storage container, be sure the container you choose:

Has a top that can be closed tightly

Is made of durable, unbreakable materials (i.e., not glass)

If possible, use a container with a narrow neck or opening so water can be poured out. DO NOT USE containers that previously have been used to hold liquid or solid toxic chemicals (bleach, pesticides, etc.)

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