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rectangular water tank
Method 1-Use this method if clean drinking water is available
from another source while the cistern or catchment system is being
disinfected. This method is a better method, but it takes longer,
because the cistern/system must be drained and refilled twice.
1. Thoroughly clean the surface catchment area (for example, rooftop)
and remove all debris.
2. Drain the cistern or storage tank completely.
3. Remove all debris from the tank.
4. Without entering the tank, scrub the inside as well as you
can with a stiff brush or broom and a solution of 1 cup (8 ounces;
approximately 0.25 liter) of 5.25% unscented chlorine bleach (sodium
hypochlorite) in 10 gallons (approximately 38 liters) of water.
5. Refill the tank with rainwater or potable water.
6. If you don't know the capacity of the tank, use the following
formula to determine the amount of water it will hold: For a rectangular
tank, multiply the depth of the tank (in feet) times the length
(feet) times the width (feet), and multiply the result by 7.5
to get the number of gallons the tank will hold. For a round tank,
multiply the length (feet) by the square of the tank radius, multiply
the result by 3.14, and then multiply that result by 7.5 to get
gallons. If neither of these methods is practical, you can estimate
the capacity in gallons by making an "educated guess,"
and then double the amount of bleach to be used in the disinfection
solution.
Metric: In metric units, multiply length (meters) X width (meters)
X height (meters) X 1,000 = capacity in liters. For round tanks,
multiply height X the radius squared (meters) X 3,140 = capacity
in liters.
7. Add 4 cups (32 ounces; approximately 1 liter) of 5.25% unscented
household bleach for every 100 gallons (approximately 380 liters)
of water in the holding tank. This should give you a chlorine
concentration of approximately 100 parts per million (ppm).
8. Run water through all plumbing used for drinking water in your
home until you notice a strong chlorine odor.
9. Let the solution sit undisturbed for 24 hours.
10. Drain the whole tank.
11. Let the tank refill with rainwater, or fill the tank with
drinkable water.
12. Flush all piping in your home until the odor of chlorine is
completely gone before you use the system again.
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needs. You design it, we build it.
rectangular
water tank
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