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Chapter 18: Maintenance
18.1.7 External Tanks
A.
Check the following points.
 No contamination inside the following external tanks.
Purified (system) Water Tank:
20L
x
1
Low conc. Wastewater Tank:
20L
x
1
High conc. Wastewater Tank:
10L
x
1
5L
x
2
Wash Solution Tank:
B.
Cleaning
1.
Discharge purified water, wastewater, or wash solution from each of the external
tanks.
2.
Pour the Wash solution C-1 diluent (diluted to 100 times with purified water) into
the external tank.
The diluent volume for each tank varies depending on the tank size.
 Purified water tank: Diluent 2L (20mL of Wash solution C-1)
 Low conc. wastewater tank: Diluent 2L (20mL of Wash solution C -1)
 High conc. wastewater tank: Diluent 1L (10mL of Wash solution C-1)
 Wash solution tank: Diluent 500mL (5mL of Wash solution C-1)
3.
Shake the tank to wash inside of the tank entirely with the wash solution and
presoak for 10 min.
4.
Discharge the diluent from the external tank.
5.
Wash inside the external tank with purified water thoroughly. (Purified water
tank and wash solution tank)
 Wash thoroughly inside the external tank with purified water to completely
remove wash solution component.
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