SYSTEM MAINTENANCE
MANOWNROSM
US Filter
22
Metal
Oxides
(Fe, Mn)
Inorganic
Salts
(CaCO
3
)
Silica
Biofilms
Organics
HCI, pH 2-2.5
x
x
x
x
Citric acid, 1% pH 4 (adjust with NaOH)
x
x
Oxalic acid, 1%
x
Citric Acid 2% Ammonium Bifluoride, 2%
pH 2, 30
°
C. maximum
x
NaOH, pH 12
x
x
Sodium Bisulfite*, 1%, pH6
x
NaEDTA 0.1% pH6
x
x
NaEDTA 0.1% NaOH 0.1% pH 12, 30
°
C.
max.
x
x
x
NaOH, 0.1% Sodium Dodecylsulfate,
0.1% pH 12, 30
°
C. max.
x
x
Sodium Triphosphate, 1.0%
Trisodiumphosphate, 1.0% Na-EDTA,
1.0%
x
x
Phosphoric Acid, 0.5%
x
x
Sulfamic Acid, 0.2%
x
x
Sodium Hydrosulfite, 2.4%
x
*
Prepare sodium bisulfite using a buffered solution of 0.1% Na2CO
3
or 0.15% NaHCO
3
J.
Preparing the Cleaning Solutions
Use the following procedures to make 10 liters (L) of solution. For larger
volumes, increase chemical amounts accordingly. The total volume of cleaning
solution depends on the system size. A minimum of 100 liters is recommended.
WARNING
Use caution when preparing these solutions. Wear safety glasses,
gloves, and a protective apron. Consult the appropriate Material Safety
Data Sheets (MSDS) before working with any chemicals.
1.
1% Oxalic Acid, pH 2-4
Add 100g anhydrous oxalic to 8.8L RO water in your cleaning tank. To
adjust the pH to 3.0, add 1.2L of 1.0N NaOH.
