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13.14 CHAPTER THIRTEEN

TABLE 13.3 Recommended Feedwater Analyses for Pressure-Driven Membrane Systems

RO, NF, and ED systems MF and UF systems
Temperature (field) Temperature (field)
pH (field) pH (field)
Alkalinity Alkalinity
Hardness Hardness
Conductivity (at 25 ° C) Iron (total and dissolved)
Evaporative TDS (at 180 ° C) Manganese (total and dissolved)
TDS by summation of major ions* Turbidity
Calcium Total suspended solids
Magnesium Chlorine residual and other strong oxidants
Total organic carbon
Sodium
Potassium Bacterial analysis
Barium Silicat
Strontium
Iron (total and dissolved)
Manganese (total and dissolved)
Bicarbonate*
Carbonate*
Hydroxide*
Carbon dioxide*
Sulfate
Chloride
Fluoride
Nitrate and nitrite
Phosphate (total)
Silica (total)
Silica (reactive)
Ammonium
Bromide
Boron
Turbidity
Total suspended solids
Silt density index (15 min) (field)
Hydrogen sulfide
Chlorine residual and other strong oxidants (field)
Total organic carbon
Radionuclides
Bacterial analyses (total plate count)
*Calculated value.
tMay react with certain MF/UF cleaning solutions.