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  2. Swimming pool sanitation - Wikipedia

    en.wikipedia.org/wiki/Swimming_pool_sanitation

    When any of these pool chemicals are used, it is very important to keep the pH of the pool in the range 7.2 to 7.8 – according to the Langelier Saturation Index, or 7.8 to 8.2 – according to the Hamilton Index; higher pH drastically reduces the sanitizing power of the chlorine due to reduced oxidation-reduction potential (ORP), while lower ...

  3. Preparer Tax Identification Number - Wikipedia

    en.wikipedia.org/wiki/Preparer_Tax...

    The new sign-up system requires return preparers to create an account, complete the PTIN application, pay a $64.25 fee and obtain a PTIN,. [2] However, immediately after the decision in 2017 in a U.S. Federal court case, [ 3 ] this fee was no longer valid and there was no fee to obtain a PTIN while the case and those similar wound their way ...

  4. Salt water chlorination - Wikipedia

    en.wikipedia.org/wiki/Salt_water_chlorination

    Salt water chlorination is a process that uses dissolved salt (1000–4000 ppm or 1–4 g/L) for the chlorination of swimming pools and hot tubs.The chlorine generator (also known as salt cell, salt generator, salt chlorinator, or SWG) uses electrolysis in the presence of dissolved salt to produce chlorine gas or its dissolved forms, hypochlorous acid and sodium hypochlorite, which are already ...

  5. Taxpayer Identification Number - Wikipedia

    en.wikipedia.org/wiki/Taxpayer_Identification_Number

    A Taxpayer Identification Number (TIN) is an identifying number used for tax purposes in the United States and in other countries under the Common Reporting Standard. In the United States it is also known as a Tax Identification Number ( TIN ) or Federal Taxpayer Identification Number ( FTIN ).

  6. Consumer Product Safety Improvement Act - Wikipedia

    en.wikipedia.org/wiki/Consumer_Product_Safety...

    The law—public law 110-314—increases the budget of the Consumer Product Safety Commission (CPSC), imposes new testing and documentation requirements, and sets new acceptable levels of several substances. It imposes new requirements on manufacturers of apparel, shoes, personal care products, accessories and jewelry, home furnishings, bedding ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  8. Phenolphthalein - Wikipedia

    en.wikipedia.org/wiki/Phenolphthalein

    Phenolphthalein's pH sensitivity is exploited in other applications: concrete has naturally high pH due to the calcium hydroxide formed when Portland cement reacts with water. As the concrete reacts with carbon dioxide in the atmosphere, pH decreases to 8.5–9. When a 1% phenolphthalein solution is applied to normal concrete, it turns bright pink.

  9. pH meter - Wikipedia

    en.wikipedia.org/wiki/PH_meter

    Beckman Model M pH Meter, 1937 [1] Beckman model 72 pH meter, 1960 781 pH/Ion Meter pH meter by Metrohm. A pH meter is a scientific instrument that measures the hydrogen-ion activity in water-based solutions, indicating its acidity or alkalinity expressed as pH. [2]

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