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2. A closed-in top prevents dust, which may convey pathogenic germs, gaining access to the water.
Cleaning.
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3. Wells should be dewatered, and cleaned out at least once every year. The sides must be scraped, and all mud, broken earthen vessels, etc., removed; quicklime must then be applied to the sides and bottom of the wells.
4. The only suitable time to clean out wells is during the hot weather as the water in them is then at its lowest level.
5. All wells must be cleaned out down to the well-curb or “Jamot.”
Disinfecting.
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6. Permanganate of potassium is a crystalline salt-like substance of a purple colour, in the preparation of which only mineral substances are employed.
FIG. 4.
Well Top
FIG. 5.
FIG. 6.
7. Put one or two ounces of the solid substance into a dol, or bucket, which has been filled with water drawn from the well about to be treated. Stir it up, and pour the red solution thus produced into the well, leaving the portion of permanganate that is not yet dissolved at the bottom of the dol. Lower the dol into the well, fill it with water, draw it up, pour back the water as before, and repeat the process till all the permanganate has been dissolved. In all cases enough permanganate should be added to produce a faint red colour lasting for 24 hours.