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11
Disinfection of Water Conditioning
Systems
The materials of construction in the modern water
conditioning system will not support bacterial growth, nor
will these materials contaminate a water supply. During
normal use, a conditioner may become fouled with
organic matter, or in some cases with bacteria from the
water supply. This may result in an off-taste or odor in the
water.
Some conditioners may need to be disinfected after
installation and some conditioners will require periodic
disinfection during their normal life.
Depending upon the conditions of use, the style of
conditioner, the type of ion exchanger, and the disinfectant
available, a choice can be made among the following
methods.
Sodium or Calcium Hypochlorite
These materials are satisfactory for use with polystyrene
resins, synthetic gel zeolite, and bentonites.
5.25% Sodium Hypochlorite
These solutions are available under trade names such as
Clorox
a
. If stronger solutions are used, such as those sold
for commercial laundries, adjust the dosage accordingly.
1. Dosage
• Polystyrene resin; 1.2 fluid ounce (35.5 mL) per
cubic foot.
• Non-resinous exchangers; 0.8 fluid ounce (23.7
mL) per cubic foot.
2. Regenerant tank conditioners
A. Backwash the conditioner and add the
required amount of hypochlorite solution to
the well of the regenerant tank. The
regenerant tank should have water in it to
permit the solution to be carried into the
conditioner.
B. Proceed with the normal regeneration.
Calcium Hypochlorite
Calcium hypochlorite, 70% available chlorine, is available
in several forms including tablets and granules. These solid
materials may be used directly without dissolving before
use.
1. Dosage
A. Two grains (approximately 0.1 ounce (3 mL)
per cubic foot.
2. Regenerant tank conditioners
A. Backwash the conditioner and add the
required amount of hypochlorite to the well of
the regenerant tank. The regenerant tank
should have water in it to permit the chlorine
solution to be carried into the conditioner.
B. Proceed with the normal regeneration.
a. Clorox is a trademark of the Clorox Company.