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2. Full-face diving mask - Wikipedia

   en.wikipedia.org/wiki/Full-face_diving_mask

   A diver in a pool wearing an AGA full face mask A diver wearing an Ocean Reef full face mask Head protection helmet for use with Ocean Reef full face diving mask. A full-face diving mask is a type of diving mask that seals the whole of the diver's face from the water and contains a mouthpiece, demand valve or constant flow gas supply that provides the diver with breathing gas. [1]

3. Waterproofing - Wikipedia

   en.wikipedia.org/wiki/Waterproofing

   In construction, a building or structure is waterproofed with the use of membranes and coatings to protect contents and structural integrity. The waterproofing of the building envelope in construction specifications is listed under 07 - Thermal and Moisture Protection within MasterFormat 2004, by the Construction Specifications Institute, and includes roofing and waterproofing materials.

4. 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 ...

5. Surface-supplied diving equipment - Wikipedia

   en.wikipedia.org/wiki/Surface-supplied_diving...

   Sasuba and hookah diving equipment is also used for boat maintenance and hull cleaning, swimming pool maintenance, and shallow underwater inspections. [ 30 ] The systems used to supply air through the hose to a demand valve mouthpiece, are either 12-volt electrical air pumps, gasoline engine powered low-pressure compressors, or floating scuba ...

6. Underwater construction - Wikipedia

   en.wikipedia.org/wiki/Underwater_construction

   Underwater concrete placement, by Tremie, skip, Pumped concrete, toggle bags, bagwork, usually to build foundations or coastal structures, and [6] grouted aggregate. [6] [7] Underwater rock blasting, or dredging of softer sediments, to clear an area of a navigational hazard, to excavate a canal or basin, or to prepare for foundations.

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