{
  "generatedFrom": "content/facts",
  "count": 15,
  "facts": [
    {
      "id": "sca-target-tds",
      "claim": "Target total dissolved solids for brewing water",
      "value": 150,
      "unit": "mg/L",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "Document version 21NOV2009A, revised 21 November 2009. The standard footnotes that TDS is measured on a 4-4-2 conversion. Linked copy is a third-party mirror of the SCAA document."
    },
    {
      "id": "sca-acceptable-tds",
      "claim": "Acceptable total dissolved solids range for brewing water",
      "value": [
        75,
        250
      ],
      "unit": "mg/L",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      }
    },
    {
      "id": "sca-target-alkalinity",
      "claim": "Target total alkalinity for brewing water",
      "value": 40,
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "The standard gives the acceptable range as \"at or near\" the target rather than as numeric bounds."
    },
    {
      "id": "sca-target-calcium-hardness",
      "claim": "Target calcium hardness for brewing water",
      "value": 68,
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "Printed as \"4 grains or 68 mg/L\"."
    },
    {
      "id": "sca-acceptable-calcium-hardness",
      "claim": "Acceptable calcium hardness range for brewing water",
      "value": [
        17,
        85
      ],
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "Printed as \"1 - 5 grains or 17 mg/L - 85 mg/L\"."
    },
    {
      "id": "sca-target-ph",
      "claim": "Target pH for brewing water",
      "value": 7,
      "unit": "pH",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      }
    },
    {
      "id": "sca-acceptable-ph",
      "claim": "Acceptable pH range for brewing water",
      "value": [
        6.5,
        7.5
      ],
      "unit": "pH",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      }
    },
    {
      "id": "sca-target-sodium",
      "claim": "Target sodium concentration for brewing water",
      "value": 10,
      "unit": "mg/L",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "The standard gives the acceptable range as \"at or near\" the target."
    },
    {
      "id": "sca-max-total-chlorine",
      "claim": "Total chlorine permitted in brewing water",
      "value": 0,
      "unit": "mg/L",
      "source": {
        "title": "SCAA Standard | Water for Brewing Specialty Coffee",
        "publisher": "Specialty Coffee Association of America",
        "url": "https://www.urbansaqua.com/wp-content/uploads/2023/09/www.urbansaqua.com-robust-ro-drinking-water-systems-water-standards.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "The standard states a single value of 0 mg/L with no acceptable range."
    },
    {
      "id": "scale-threshold-moderate",
      "claim": "Upper bound of soft water; above this, water is at least moderately hard",
      "value": 60,
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "Hardness in Drinking-water: Background document for development of WHO Guidelines for Drinking-water Quality",
        "publisher": "World Health Organization",
        "url": "https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/hardness-bd.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "WHO/HSE/WSH/10.01/10/Rev/1, section 1.1, citing McGowan (2000). Consumed as the moderate threshold by classifyScaleRisk."
    },
    {
      "id": "scale-threshold-high",
      "claim": "Upper bound of moderately hard water; above this, water is classified as hard",
      "value": 120,
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "Hardness in Drinking-water: Background document for development of WHO Guidelines for Drinking-water Quality",
        "publisher": "World Health Organization",
        "url": "https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/hardness-bd.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "Consumed as the high threshold by classifyScaleRisk."
    },
    {
      "id": "scale-threshold-very-hard",
      "claim": "Concentration above which water is classified as very hard",
      "value": 180,
      "unit": "mg/L as CaCO3",
      "source": {
        "title": "Hardness in Drinking-water: Background document for development of WHO Guidelines for Drinking-water Quality",
        "publisher": "World Health Organization",
        "url": "https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/hardness-bd.pdf",
        "retrievedOn": "2026-07-25"
      }
    },
    {
      "id": "calcium-taste-threshold",
      "claim": "Taste threshold range for the calcium ion in drinking water",
      "value": [
        100,
        300
      ],
      "unit": "mg/L",
      "source": {
        "title": "Hardness in Drinking-water: Background document for development of WHO Guidelines for Drinking-water Quality",
        "publisher": "World Health Organization",
        "url": "https://cdn.who.int/media/docs/default-source/wash-documents/wash-chemicals/hardness-bd.pdf",
        "retrievedOn": "2026-07-25"
      },
      "note": "Section 1.3. Varies with the associated anion."
    },
    {
      "id": "epsom-magnesium-fraction",
      "claim": "Magnesium content of Epsom salt by mass",
      "value": 9.861,
      "unit": "% by mass",
      "source": {
        "title": "Standard Atomic Weights",
        "publisher": "IUPAC Commission on Isotopic Abundances and Atomic Weights",
        "url": "https://www.ciaaw.org/atomic-weights.htm",
        "retrievedOn": "2026-07-25"
      },
      "note": "Derived, not quoted: Mg 24.305 / MgSO4.7H2O 246.466 = 0.09861, using CIAAW standard atomic weights."
    },
    {
      "id": "baking-soda-bicarbonate-fraction",
      "claim": "Bicarbonate content of sodium bicarbonate by mass",
      "value": 72.63,
      "unit": "% by mass",
      "source": {
        "title": "Standard Atomic Weights",
        "publisher": "IUPAC Commission on Isotopic Abundances and Atomic Weights",
        "url": "https://www.ciaaw.org/atomic-weights.htm",
        "retrievedOn": "2026-07-25"
      },
      "note": "Derived, not quoted: HCO3 61.016 / NaHCO3 84.006 = 0.7263, using CIAAW standard atomic weights."
    }
  ]
}