Install Instructions

System Disinfection
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IM-PF 724596 1021 PureFlow Water System (EN)
15 System Disinfection
Public potable water distribution systems today generally require some
form of residual disinfection to greatly eliminate or render harmless
waterborne pathogens such as E. coli and Legionella. Some commonly
used disinfection methods include the use of chlorine, chloramines, and
chlorine dioxide at levels not to exceed EPA established levels. These
can be used at the water supply/municipality as a primary treatment and
within a building as a secondary treatment.
Viega LLC does not recommend use of Viega PureFlow PEX tubing as
part of any potable water distribution system in buildings where chlorine
dioxide is used as a secondary disinfection or where injection systems
using chlorine dioxide are present. This is based on the limited industry
data available for the long-term e󶈴ects of chlorine dioxide on PEX tubing
at allowable controlled levels. This does not include the disinfection /
commissioning of a new or repaired system.
Local codes may require system disinfection. When no other method is
available, follow the time limitations and exposure levels shown below.
1. Use a chlorine solution and one of the exposure durations listed below:
Concentration Period Authority
200 ppm 3 hours IPC/UPC
®
50 ppm 24 hours IPC/UPC
®
2. Mix the disinfection solution thoroughly before adding it to the system.
3. The chlorine solution must reach all parts of the system. Open all 󶈵xtures
(both sides) and 󶈶ow water until a chlorine smell is present. As an alternative,
chlorine test tablets can be used to detect chlorine at each 󶈵xture.
4. The chlorine source for the solution can be, but is not limited to, the following:
Chlorine
Source
% Active
Chlorine
Form Amount per 100 Gallons Water
for 200 ppm Solution
Laundry bleach 5.25 Liquid 3 pints (48 oz.)
5. After the solution has been in the system for the time required by the
Authority Having Jurisdiction (AHJ) or the exposure durations listed in
Step 1, the system shall be 󶈶ushed completely with potable water.
6. The system must be purged or drained of all water or protected from freezing.
15.1 General
FAILURE TO FLUSH THE SYSTEM NOTICE!!
To prevent reduced service life of system components,
disinfection solutions shall not be allowed to stand in the
system longer than 24 hours. Thoroughly 󶈶ush the system
with potable water after disinfection.