Cleaning Or Sanitizing With Sodium Percarbonate - Siemens IONPURE VNX50HH-2 Operation & Maintenance Manual

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STEP 2: Water Flush To Drain
This Step flushes the cleaning solution out of the system, and prepares the system for
return to operation.
1. Remove product and reject lines from the cleaning tank and direct to drain.
2. Close the cleaning pump discharge valve.
3. Turn on the feed water supply to the system. Slowly open the feed valve to allow
RO product water to flow through the module to drain.
4. After flushing all residual cleaning solutions from the system, disconnect the
cleaning equipment.
5. Follow the initial start-up procedures in Section 5 of this manual. Start without the
DC power applied to the VNX module for five minutes, and then apply normal
operating DC power.
6.10.

Cleaning or Sanitizing with Sodium Percarbonate

Sodium percarbonate, sodium carbonate, and hydrogen peroxide are
corrosive chemicals. Avoid contact with these chemicals.
Do not use powdered sodium percarbonate. It may contain impurities that
could harm the module.
Sodium percarbonate is a combination of sodium carbonate (soda ash) and hydrogen
peroxide. It is an effective biocide and it reduces organic fouling and plugging. In
addition, it is an effective cleaner for removal of biofilms.
Flush the VNX module with a 5% Sodium Chloride (NaCl) solution both before and after
sodium percarbonate sanitization. The initial NaCl rinse removes metal ions, particularly
calcium, and magnesium ions from the module.
The sanitization procedure for sodium percarbonate involves five steps:
1. An initial salt flush
2. A water flush
3. The percarbonate cleaning
4. A second salt flush
5. A final water flush
STEP 1: Initial Salt Flush To Drain
This initial 5% NaCl rinse removes any metal ions, particularly calcium and magnesium
ions, from the module.
Chemicals needed for Step 1 (5%NaCl):
Water (RO permeate or CEDI product)
Sodium chloride (NaCl)
The following cleaning procedures are based on the piping setup shown in Figure 6-1
NOTE:
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VNX50HH-2 CEDI Modules
VNX50-HH
180 gal (675 liters)
75 lbs (34.2 kg)
IP-MAN-VNX50HH2