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Adequate. It will most likely aim far better than you can shoot.
The average atomic mass can be calculated as the weighted average of the masses of each isotope, using their percentages as the weights. In this case, the average atomic mass would be: (0.4 * 16 amu) + (0.6 * 18 amu) = 6.4 amu + 10.8 amu = 17.2 amu.
The notation "4 16x40" typically refers to a measurement or specification in a context like woodworking or construction. It often means a piece of lumber that is 16 inches wide and 40 inches long, with the "4" possibly indicating a quantity or another measurement related to the material or project. In other contexts, it could refer to a different set of dimensions or specifications, so the exact meaning may depend on the specific field or application.
Depends on water pressure and how many hoses you use. Overnight
Currently at Leslies pool supplies you can purchase a Hayward goldline salt system for 1179. That includes a Salt cell and controller panel. You would also need salt to turn the pool into salt water. Salt is 8.99 for 40lbs and around 500 lbs will be needed depending on the size of the pool. Installation runs about $169. I have seen these systems go on sale for 879.