CEN/TC 164
| Registration number (WIID) | Project No. | Title | Status |
|---|---|---|---|
| 40506 | prEN 939 | Chemicals used for treatment of water intended for human consumption - Hydrochloric acid | Izstrādē |
| 74264 | prEN 973 rev | Chemicals used for treatment of water intended for human consumption - Sodium chloride for regeneration of ion exchangers | Izstrādē |
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