will kill the remaining bacteria that survive the filter, but, more
importantly, chlorine prevents the recontamination of stored water
that naturally occurs, particularly in higher temperatures.
5. How do I add chlorine to the water?
Add chlorine to the container in which the clean water will be
stored. It is recommended that sufficient chlorine be added to kill
all the bacteria plus a little more to protect the water. It is difficult
to precisely calculate how much chlorine to add to the water
because of variables in the water and the concentration of the
chlorine solution. Typically, it is recommended to add between
2 and 4 drops of chlorine to each liter of water and to allow it to
rest about 30 minutes before consuming. When a slight
detectable flavor and scent are present, then sufficient chlorine
has been added.
IMPORTANT:
Do not add chlorine to source water before pouring
it into the filter. Putting chlorine into the top of the filter can kill the
biological layer.
6. How do I find out if the turbidity of the water is less than
70–100 UOT?
Fill a clear plastic 2-liter bottle with water. Place the bottle on
its side on a newspaper or similar printed material. Look down
from above through the water. If you can read the words on the
paper, the water is less than 70–100 UOT and can be poured
directly into the filter. If the words are not readable, see
Question #3.
7. Can the Hydraid
®
BioSand Water Filter remove industrial
pesticides, polluting agents, salt from seawater or other
chemicals?
The Hydraid
®
BioSand Water Filter does not remove salt from
seawater. Salt water should never be put into the filter. The filter
does not eliminate contaminants such as industrial pesticides,
polluting agents, fluoride, or heavy metals dissolved in the water.
It is possible to make some modifications to the filter to help
remove such contaminants. Appropriate solutions can only be
determined through testing. The Hydraid
®
BioSand Water Filter
is not approved by the U.S. Environmental Protection Agency for
drinking water in the United States.
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Summary of Contents for BioSand
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