Regal 53 SC Owner's Manual page 135

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 disinfect the potable water system
when entering long periods of storage, at the beginning
of your boating season or if you suspect your fresh water
is contaminated.
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.
CHLORINE COMPOUND AMOUNTS REQUIRED FOR 100 PPM SOLUTION
SOLUTION
(GALLONS)
5
10
15
20
30
50
100
NOTE: Information from this chart taken from Handbook on Sanitation of Vessel Water Points- US Public Health
Service Publication No.274 reprinted June 1963
DISINFECTION OF POTABLE WATER SYSTEM
CHLORINATED LIME
25% (OUNCES)
0.3
0.6
0.9
1.2
1.8
3.0
6.0
4. Drain chlorine solution from entire system.
5. Flush whole system thoroughly with fresh potable water.
6. Fill system with fresh potable water.
HIGH TEST CALCIUM
HYPOCHLORITE 70%
0.1
0.2
0.3
0.4
0.6
1.0
2.0
83
Systems
LIQUID SODIUM
HYPOCHLORITE
1% (QUARTS)
0.2
0.4
0.6
0.8
1.2
2.0
4.0