Operator`s manual

WRO 300

P/N 3027435 Rev. C

Regular Maintenance

3.2 Cleaning

3.2.1 Acid Cleaning

Acid cleaning should be performed when:

• Rejection rate has decreased by more than 5 percent from initial

value.

• Sufficient output flow is not obtained.

• As preventive measure when a softener is not used.

• As a method to remove transitional metals from the RO membrane

prior to chemical disinfection.

Dissolve 100 ml of citric acid in 200 ml of product water from the

WRO 300. This will result in a 2 percent solution in the WRO 300 or

use MINNCLEAN

AC according to manufacture’s instruction.

Refer to Cleaning Procedure on page 23.

3.2.2 Alkaline Cleaning

Alkaline cleaning should be performed when:

• Product performance is affected and cleaning with acid does not

improve performance.

• Organic fouling is suspected.

Use MINNCLEAN

TF according to manufacture’s instruction.

Refer to Cleaning Procedure below.

3.2.3 Cleaning Procedure

Step 1 Press until the display shows RUN. Wait until the product

water conductivity stabilizes and record the value. Press

until light goes out to stop the WRO.

NOTE

During the intake phase of the central chem program, the product

water loop will not be pressurized until the correct conductivity has

been obtained, which will take a few minutes.

NOTE

Other acid membrane cleaner may be used as an alternative cleaner

for the WRO 300. Follow manufacturer’s guidelines to prepare the

cleaning solution.