Appendix B
Page 5
Chlorination
See text for chemistry and effectiveness of free chlorine.
Sodium Hypochlorite
Household Bleach
Liquid household bleach is a hypochlorite solution that comes in various concentrations,
usually 5.25%. This has the convenience of easy availability, low cost, high stability, and
administration with a dropper.
Sodium hypochlorite solutions are vulnerable to significant loss of available chlorine
over time. Stability is greatly affected by heat and light. Five percent solution loses about
10% available chlorine over 6 months at 21° C (70° F) and freezes at 4.4° C (24° F). If
bleach containers break or leak in a pack, the liquid is corrosive and stains clothing.
Drinkwell from Katadyn
Available from FirstWater
http://www.firstwater.info/noflash/pdct_prsnel_chem.html
10 ml bottle can treat 100 liters using 3 drops/liter. Stable for 3 years if stored under
25C.
SweetWater Viral Stop
2oz squeeze dropper bottle
$9
Calcium Hypochlorite (dry chlorine)
Calcium hypochlorite is a stable, concentrated, dry source of hypochlorite that is
commonly used for chlorination of swimming pools.
