I've been using Purrissima for 10 years to purify the water the comes out of the faucet.
For the 16 years that my wife and I lived on a cruising sailboat, we used clorox. Purrissima is more concentrated so don't need to use as much.
A Peace Corps manual that I saw said that clorox was a good way to purify water, more effective than boiling unless you let the water boil for 20 minutes or so.
--------------------
Three relevant points to make:
1) it is not necessary to boil water in order to make it safe. Pasteurization is achieved at 65? C and uses a lot less fuel to do so than boiling it. It can be done with solar, which would certainly help those in rural DR and almost all of Haiti, but somehow doesn't get promoted in order to save the trees.
Source:
A SUMMARY OF WATER PASTEURIZATION TECHNIQUES
2. The effectiveness of chlorine depends on many things: the water's pH, the temperature, the amount of time it is in the water, etc. As the pH goes up, it takes more and more chlorine to get the desired effect (see the charts attached). The last time I tested the water in my plant in Santo Domingo, the pH was in the 7.7 pH area. (relatively high pH coming straight out of the municipal water system)
Most people adding chlorine to a cistern use TOO MUCH. If you can smell the chlorine when the water is coming out of the tap, it is probably too much. Chlorine is a suspected carcinogen.
Bacteria in Drinking Water, Bulletin 795 - Chlorine
3) UV is another way to purify water. I used one of these units along with inline cartridge filters in my plant to assure that the water was indeed pure. I still have this commercial-sized unit along with a replacement UV bulb. The cost new was around US$750 for the unit and replacement bulbs were about $40, with a 3/4" supply line. PM me if you have any interest.