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Chapter 10
DISENFECTION OF POTABLE WATER SYSTEM
The following information is taken from the Handbook
on Sanitation
of Vessel Water Points and is available from
the public health service publication #274.
It is a good idea to disenfect the potable water system
when entering long periods of storage or at the beginning
of your boating season.
Following is a suggested method in proper order to
accomplish system disinfection:
1. Flush entire system completely by permitting potable
water to fl ow through it.
2. Drain system completely.
3. Fill entire system with a chlorine solution having a
strength of 100 parts per million, and allow to sit for one
hour. Shorter time frames will require more concentrations
of chlorine solution. See the chart.
The chart below indicates how much disinfecting agent is needed to make up various quantities of 100 parts per
million chlorine solution.
4. Drain chlorine solution from entire system.
5. Flush whole system thoroughly with fresh potable
water.
6. Fill system with fresh potable water.
CHLORINE COMPOUND AMOUNTS REQUIRED FOR 100 PPM SOLUTION
SOLUTION
(GALLONS)
CHLORINATED LIME
25% (OUNCES)
HIGH TESTCALCIUM
HYPOCHLORITE 70%
LIQUID SODIUM
HYPOCHLORITE
1% (QUARTS)
5 0.3 0.1 0.2
10 0.6 0.2 0.4
15 0.9 0.3 0.6
20 1.2 0.4 0.8
30 1.8 0.6 1.2
50 3.0 1.0 2.0
100 6.0 2.0 4.0
NOTE: Information from this chart taken from Handbook on Sanitation of Vessel Water Points- US Public Health
Service Publication No.274 reprinted June 1963
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