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  2. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    It has been used by researchers as a marker to estimate the degree to which swimming pools are contaminated by urine. [6] It was estimated that a commercial-size swimming pool of 220,000 gallons would contain about 20 gallons of urine, equivalent to about 2 gallons of urine in a typical residential pool.

  3. Hot tub - Wikipedia

    en.wikipedia.org/wiki/Hot_tub

    A 5-seat hot tub with a cast acrylic shell, supported by a frame structure, showing vents for water circulation and massage Outdoor hot tubs. A hot tub is a large tub full of water used for hydrotherapy, relaxation or pleasure. Some have powerful jets for massage purposes. Hot tubs are sometimes also known as "spas" or by the trade name Jacuzzi ...

  4. Basis of estimate - Wikipedia

    en.wikipedia.org/wiki/Basis_of_estimate

    A pivot table in BOEMax, a Basis of Estimate software package. To create a BOE companies, throughout the past few decades, have used spreadsheet programs and skilled cost analysts to enter thousands of lines of data and create complex algorithms to calculate the costs. These positions require a high level of skill to ensure accuracy and ...

  5. Swimming pool - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool

    Acesulfame potassium has been used to estimate how much urine is discharged by swimmers into a pool. [39] A Canadian study estimated that swimmers had released 75 litres of urine into a large pool that had about 830,000 litres of water and was a third of the size of an olympic pool. Hot tubs were found to have higher readings of the marker ...

  6. Uniform Swimming Pool, Spa and Hot Tub Code - Wikipedia

    en.wikipedia.org/wiki/Uniform_Swimming_Pool,_Spa...

    Designated as an American National Standard, the Uniform Swimming Pool, Spa and Hot Tub Code (USPSHTC) is a model code developed by the International Association of Plumbing and Mechanical Officials to govern the installation and inspection of plumbing systems associated with swimming pools, spas and hot tubs as a means of promoting the public's health, safety and welfare.

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