1. Have a back-up plan.
2. I can pretreat very large volumes of water for cleaning, baths, etc.
3. And the base you can make from calcium hypochlorate is a good sanatizer.
Gotcha. I was taking it as you thinking you needed it in addition to the Berkey filtered water. Be aware that chlorine added to water that has organics in it will create trihalomethane (carcinogen) in the water.
Reading through several of these posts, I am reminded that a couple of nights ago during an insomniac period I was refreshing my memory of data I have stuck in my emergency file. So FYI I am just posting it here, in case someone might benefit from the info.
One of the articles was from the CDC re: Safe Water Systems.
Sodium Hypochlorite may be used and is what they advise. (Most likely for larger group than just a family).
If I understood the article, it is because there is better standardization of product when compared to Calcium Hypochlorite.
They also mention the necessity of filtering first to get rid of Giardia or Cryptosporidium, if that is a problem in your area.