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Industrial water storage tanks should be cleaned and disinfected a minimum of once a year. In communities where the water supply has high levels of sediment at certain times of the year, cleaning more often is recommended.

Generally, a device injects potassium permanganate into the water in between the pump and holding tank. When treating a well, a concentration of 3.8 to 7.6 grams per gallon helps to remove iron bacteria. After the mixture has been fed into the well, agitation will make the treatment even more effective.

The most common way of disinfecting a industrial water tank is by chlorination. Chlorine is delivered in a variety of ways but the most common is high-strength calcium hypochlorite (hsch), which, when mixed with water, liberates 60 to 80% of its volume as chlorine.

Cleaning industrial water tanks regularly will help prevent algae from lining the interior and keep sediments from building up at the bottom of the tank. It will also limit disease-carrying insects and vermin from residing in the tank. A clean water tank will also allow it to maintain water quality, color and

Mix one cup of bleach to four gallons of water for a 40 gallon tank, one and a half cups of bleach to six gallons of water for a 60 gallon tank, and two cups of bleach to eight gallons of water for a 100 gallon tank. Add the bleach solution to tank, then fill it up all the way with fresh water.

Water doesn't expire or go bad, but can only become biologically or chemically contaminated. If water that started out clean has been stored for some time in a cool, dark, and dry area, not directly on concrete, and away from harmful chemicals and harsh fumes, it technically can be stored indefinitely.