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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 ...

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   Discover the latest breaking news in the U.S. and around the world — politics, weather, entertainment, lifestyle, finance, sports and much more.

4. Hayward Area Recreation and Park District - Wikipedia

   en.wikipedia.org/wiki/Hayward_Area_Recreation...

   Hayward Plunge at Memorial Park. The Hayward Area Recreation and Park District (H.A.R.D.) is the park management agency for most of the parks in the city of Hayward, California. It was created in 1944 [1] and is an independent special district under California law. [2] H.A.R.D. is the largest recreation district in California. [3]

5. Own a pool in Southern California? New air-quality rule ...

   www.aol.com/news/own-pool-southern-california...

   Bans on large gas-fired units and pool heaters will begin in 2027, and high-temperature units in 2029. Gas-fired water heaters will be banned from existing buildings once the appliances reach a ...

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7. List of companies based in Hayward, California - Wikipedia

   en.wikipedia.org/wiki/List_of_companies_based_in...

   This is a dynamic list and may never be able to satisfy particular standards for completeness. You can help by adding missing items with reliable sources. This is a list of current and former companies operating in, or based in, Hayward, California. Significant local divisions of national and international companies are included, as are local businesses. Former companies that have closed, been ...