SNOWPURE, LLC, 2005-2018
VERSION 3.5 (XL+EXL)
–FEBRUARY 2018
PAGE 79
Appendix #11: EDI Module Storage and EDI System Shutdown
SnowPure’s recommendations for module storage and for EDI system shutdown and
startup are based on our experience and our customers’ experience. The primary
criterion for how to store modules and shutting down systems is the prevention of
bacterial growth.
The actions suggested below depend on “ambient” temperature and length of
planned shutdown. When an EDI is in operation, its bacteriostatic properties usually
prevent bacterial colonies from propagating and growing. Bacteria will propagate
rapidly in ultrapure water
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from 25-
35˚C. If the system is under 15-18˚C, bacterial
growth is much slower.
Summary Matrix (suggested actions):
Less than 1 day
1 to 7 days
8 to 31 days
> 1 month
Power
Generation
Normal shutdown
Normal startup
Normal shutdown
Startup with Regen*
Sanitize on shutdown
Startup with Regen*
Sanitize on shutdown
Drain and seal system
Sanitize on startup
General
Industrial
Normal shutdown
Normal startup
Normal shutdown
Startup with Regen*
Sanitize on shutdown
Startup with Regen*
Sanitize on shutdown
Drain and seal system
Sanitize on startup
Semiconductor
(bacterial
sensitive)
Normal shutdown
Startup with Regen*
Sanitize on shutdown
Startup with Regen*
Sanitize on shutdown
Drain and seal system
Sanitize on startup
Sanitize on shutdown
Drain and seal system
Sanitize on startup
Pharmaceutical
(highly bacteria
sensitive)
Normal shutdown
Check for bacteria on
startup
Sanitize if necessary or
according to policy
Sanitize on shutdown
Drain and seal system
Sanitize on startup
Sanitize on shutdown
Drain and seal system
Sanitize on startup
Sanitize on shutdown
Drain and seal system
Sanitize on startup
* “Startup with Regen”: in order to minimize any bacterial colonies present, a startup
sequence may include a 1-hour to 4-hour period of operation in regeneration mode.
This specifically includes operation at regeneration voltage (see Appendix 5).
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