"potash water" meaning in English

{
  "forms": [
    {
      "form": "potash waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "potash water (countable and uncountable, plural potash waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        {
          "kind": "other",
          "name": "English entries with incorrect language header",
          "parents": [
            "Entries with incorrect language header",
            "Entry maintenance"
          ],
          "source": "w"
        }
      ],
      "glosses": [
        "A kind of aerated water containing potassium bicarbonate, used for medicinal purposes."
      ],
      "id": "en-potash_water-en-noun-mjN9snkR",
      "links": [
        [
          "aerate",
          "aerate"
        ],
        [
          "water",
          "water"
        ],
        [
          "potassium",
          "potassium"
        ],
        [
          "bicarbonate",
          "bicarbonate"
        ],
        [
          "medicinal",
          "medicinal"
        ]
      ],
      "raw_glosses": [
        "(historical) A kind of aerated water containing potassium bicarbonate, used for medicinal purposes."
      ],
      "tags": [
        "countable",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "potash water"
}

{
  "forms": [
    {
      "form": "potash waters",
      "tags": [
        "plural"
      ]
    }
  ],
  "head_templates": [
    {
      "args": {
        "1": "~"
      },
      "expansion": "potash water (countable and uncountable, plural potash waters)",
      "name": "en-noun"
    }
  ],
  "lang": "English",
  "lang_code": "en",
  "pos": "noun",
  "senses": [
    {
      "categories": [
        "English countable nouns",
        "English entries with incorrect language header",
        "English lemmas",
        "English multiword terms",
        "English nouns",
        "English terms with historical senses",
        "English uncountable nouns"
      ],
      "glosses": [
        "A kind of aerated water containing potassium bicarbonate, used for medicinal purposes."
      ],
      "links": [
        [
          "aerate",
          "aerate"
        ],
        [
          "water",
          "water"
        ],
        [
          "potassium",
          "potassium"
        ],
        [
          "bicarbonate",
          "bicarbonate"
        ],
        [
          "medicinal",
          "medicinal"
        ]
      ],
      "raw_glosses": [
        "(historical) A kind of aerated water containing potassium bicarbonate, used for medicinal purposes."
      ],
      "tags": [
        "countable",
        "historical",
        "uncountable"
      ]
    }
  ],
  "word": "potash water"
}