Salt can be very therapeutic, but a trip to the beach is usually quite expensive.
According to WorldBook Encyclopedia, the ratio of salt to water in the ocean averages about 35 to 965, which is about 1:28.
The salinity of Salt Lake is about 7 times that of the ocean, which would make the salt to water ratio about 1:4. The salinity of the Dead Sea is about 9 times the salinity of the ocean, which would make that ratio about 1:3.
That is a lot of salt to drain from a bathtub every day.
To know how much salt to use, it helps to know how many gallons are in a square foot and knowing the specific gravity (the ratio of the density to the density of water) of salt, also known as sodium chloride.
I wonder what grows in the Dead Sea that brine shrimp eat?