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  2. Water canister - Wikipedia

    en.wikipedia.org/wiki/Water_canister

    Threads for caps and taps are standardized to some degree, with many European designs being based on various DIN standard sizes. Some common thread diameters on European water canisters are 40 mm, 45 mm, 50 mm and 60 mm. [citation needed] A tap can either be an integrated part of the container (for example protected by a ridge) or an accessory.

  3. Grain per gallon - Wikipedia

    en.wikipedia.org/wiki/Grain_per_gallon

    The grain per gallon (gpg) is a unit of water hardness defined as 1 grain (64.8 milligrams) of calcium carbonate dissolved in 1 US gallon of water (3.785412 L). It translates into 1 part in about 58,000 parts of water or 17.1 parts per million (ppm). Also called Clark degree (in terms of an imperial gallon).

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