7
Storage & W
interization
DISINFECTION OF POTABLE WATER SYSTEM
e 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 disinfect 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 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.
e 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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