Disinfection Procedure - Sterilight Silver SQ-PA Owner's Manual

D
ISINFECTION
UV disinfection is a physical disinfection process and does not add any
potentially harmful chemicals to the water. As UV does not provide a
disinfection residual, it is imperative that the entire distribution system
located after the UV be chemically disinfected to ensure that the water is
free from any bacteriological contaminants. The disinfection process must
be performed immediately after the UV unit is installed and repeated
thereafter whenever the UV is shut down for service, without power, or
inoperative for any reason. The procedure for sanitizing the plumbing
system is readily accomplished as follows:
1. Remove the pre-filter cartridge and fill the sump with 1-2 cups of
household (5.25%) bleach (chlorine) – Do NOT use hydrogen peroxide.
At all times during this process, make sure the UV unit (and lamp) is
turned on and operational!
2. Open every faucet and allow cold water to run until the chlorine is
detected. When you smell chlorine, shut the faucet off and then repeat
the process on the hot water side. You must ensure that all taps,
including outside faucets, dishwashers, showerheads, washing machines,
connections to refrigerators, toilets, etc., pass chlorinated water.
3. Once all the locations have passed the chlorine disinfection solution, you
will need to leave the solution sit for a period of 20 – 30 minutes.
Reinstall the pre-filter cartridge into the filter and then flush the chlorine
solution from the system. Make sure that each fixture that was
disinfected in step two is completely flushed of the chlorine solution as
the consumption of this water is not advised due to the extremely high
concentrations of chlorine. It is important to remember that in the event
that a UV is briefly shut down for routine cleaning or during power
interruptions where water could have passed through the system, the
aforementioned procedure must also be followed.
4. The addition of chlorine (bleach) to a hot water tank that has in the past
been fed with untreated raw water with high levels of other
contaminants (iron, manganese, hydrogen sulphide, organics, etc.) will
result in oxidation of these contaminants and may require repeated
flushing of the hot water tank. This contingency must be dealt with
independently under the start-up procedure for any other conditioners
that may form a part of the pre-treatment for the UV unit.
5. The above procedure (Steps 1 to 3) will result in a massive chlorine
residual far in excess of the 0.5 to 1.0 mg/L typically present in
municipally chlorinated water and of a magnitude consistent with the
minimum 50 mg/L chlorine solution recommended for the disinfection of
distribution systems known to be contaminated.
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ROCEDURE
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