# Water--Softening

{
  "id": "S85145509",
  "title": "Water--Softening",
  "url": "/topics/S85145509",
  "kind": "topic-directory",
  "aeo_cohort": "topic-directory",
  "provider": "lcsh",
  "revision": "780c26a2617b4ce3",
  "catalogue_revision": "f050b5d4780b1289",
  "numeric_address": "9513937776845145664",
  "address_version": "morton4x16-v1",
  "coordinates": [
    0,
    20,
    19678,
    37888
  ],
  "answer_status": "Directory metadata; local answer requires separate source review",
  "truth_status": "Subject descriptor, not a factual answer or a demonstrated knowledge gap"
}

Works dealing with the treatment of water used in steam-boilers are entered under the heading [Feed-water purification.]

Directory metadata is not a factual answer or evidence of a global knowledge gap.

Source: https://id.loc.gov/authorities/subjects/sh85145509

No owner-reviewed local answer yet.