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2. Los Angeles abrasion test - Wikipedia

   en.wikipedia.org/wiki/Los_Angeles_abrasion_test

   The Los Angeles machine defined in the standard is a simple ball mill of specified size and shape [3] The standard charge of rock is set at 2.5–5 kilograms (5.5–11.0 lb) depending on the size of the particles. [4]

3. Hardness scales - Wikipedia

   en.wikipedia.org/wiki/Hardness_scales

   The Leeb rebound hardness scale; The Rosiwal scale; The Meyer hardness test; ... Methods of measuring the deposit formation by hard water. The scale of Pencil hardness

4. Hard water - Wikipedia

   en.wikipedia.org/wiki/Hard_water

   A bathtub faucet with built-up calcification from hard water in Southern Arizona. Hard water is water that has a high mineral content (in contrast with "soft water"). Hard water is formed when water percolates through deposits of limestone, chalk or gypsum, [1] which are largely made up of calcium and magnesium carbonates, bicarbonates and sulfates.

5. William Mulholland - Wikipedia

   en.wikipedia.org/wiki/William_Mulholland

   William Mulholland (September 11, 1855 – July 22, 1935) was an Irish American self-taught civil engineer who was responsible for building the infrastructure to provide a water supply that allowed Los Angeles to grow into the largest city in California.

6. Los Angeles set to build facility to transform wastewater ...

   www.aol.com/news/los-angeles-set-build-facility...

   Los Angeles will soon begin building a $740-million project to transform wastewater into purified drinking water in the San Fernando Valley, expanding the city’s local water supply in an effort ...

7. ‘Chinatown,’ released 50 years ago, was inspired by some ...

   www.aol.com/chinatown-inspired-los-angeles-water...

   The efforts to divert water from the faraway Owens Valley near Mammoth Lakes, CA – some 230 miles from Los Angeles – began as early as 1908, with the start of the construction of the Los ...

8. Hardness comparison - Wikipedia

   en.wikipedia.org/wiki/Hardness_comparison

   A variety of hardness-testing methods are available, including the Vickers, Brinell, Rockwell, Meyer and Leeb tests. Although it is impossible in many cases to give an exact conversion, it is possible to give an approximate material-specific comparison table for steels .

9. After massive sewage spill, feds order fixes at L.A. water ...

   www.aol.com/news/massive-sewage-spill-feds-order...

   Following a massive sewage spill in 2021, the Environmental Protection Agency has ordered improvements at the Hyperion water treatment plant in Playa del Rey.