A variety of minerals are referred to as salts, and give seawater its characteristic qualities. Outside of laboratory experiments, salinity is most commonly measured by aquarium hobbyists, and farmers concerned about possible salt buildup in the soil. While there are several devices you can use to measure salinity, finding the correct salinity depends greatly on your specific purpose. Consult an aquarium instruction manual, or information on a particular crop, in order to find out what salinity measurements to aim for.
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