The phrase "salt content" refers to the amount of salt that is present in something, like food or water. It tells you how much salt is contained in that particular thing. Full definition
Although the reasons for this variation are not clear, the marked differences in salt content of very similar products suggest that technical reasons are not a primary explanation. (cmaj.ca)
The hot - water tanks were in the space between the first and second floors, and what I assume was the high salt content of the water shortened the lives of those tanks. (rismedia.com)
Although a minimum level for sodium intake has been established, there is no established maximum of salt content in cat foods. (onpets.com)