Wilderness Medical Society snowmass 2005 Page 234
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Water Disinfection Techniques and Halogen Doses
Iodination techniques
added to 1 liter or quart of clear water
amount for 4
ppm
amount for 8
ppm
Iodine tabs
tetraglycine hydroperiodide
EDWGT (emergency drinking water germicidal
tablet)
Potable Aqua
Globaline
1/2 tab
1 tab
2% iodine solution (tincture)
0.2 ml
5 gtts
0.4 ml
10 gtts
10% povidone-iodine solution*
0.35 ml
8 gtts
0.70 ml
16 gtts
Saturated solution: iodine crystals in water
13 ml
26 ml
Saturated solution: iodine crystals in alcohol
0.1 ml
0.2 ml
Chlorination techniques
amount for 5
ppm
10 ppm
Household bleach 5%
Sodium hypochlorite
0.1 ml
2 gtts
0.2 ml
4 gtts
AquaClear
Sodium dichloroisocyanurate
1 tab
AquaCure, AquaPure, Chlor-floc
Chlorine plus flocculating agent
8 ppm/ tab
Measure with dropper (1drop=0.05 ml) or tuberculin syringe.
*Povidone-iodine solutions release free iodine in levels adequate for disinfection,
but scant data are available.
Contact time in minutes at various water temperatures
Concentration of
halogen
5 C
15 C
30 C
2 ppm
240
180
60
4 ppm
180
60
45
8 ppm
60
30
15
