FDI P2131, Technical Manual, Page: 160 / 161

A.6 Suggested Maximum Values of Contaminants in Feed Water
Contaminant Value
Residue on Evaporation ≤ 10 mg/L
Silicate ≤ 1 mg/L
Iron ≤ 0.2 mg/L
Cadmium ≤ 0.005 mg/L
Lead ≤ 0.05 mg/L
Rest of heavy metals except Iron, Cadmium, Lead ≤ 0.1 mg/L
Chloride ≤ 0.5 mg/L
Free Chlorine ≥ 0.2 mg/L
Phosphate ≤ 0.5 mg/L
Conductivity ≤ 5 µS/cm
pH (20°C, 68°F) Value 5 – 7.5
Appearance Colorless; clean without sediment
Hardness ≤ 10 mg/L
Total Dissolved Solids (TDS) ≤ 50 ppm
NOTE:
1. Reference Section 2.5 Water Supply Quality. It is the responsibility of the user to
supply feedwater that meets FDA bottled water criteria.
2. Reference Section 3.4 Operational Checklists, Testing Total Dissolved Solids (TDS),
FDA ‐ Required Water Changeout, and Testing Free Chlorine Level. It is the
responsibility of the user to maintain feedwater quality by performing necessary
maintenance on the SWS.
3. 1 mg/L is equal to 1 ppm (parts per million)
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