How much water is lost through a commercial cooling tower system with a throughput of about 600 GPM?

How much water is lost through a commercial cooling tower system with a throughput of about 600  GPM?
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Answer :

This question depends on many factors. It sounds like the tower is small. A rule of thumb suggests that  the tower will see an evaporation loss of about 0.1% of the circulation flowrate for each Fahrenheit  degree of cooling. Other losses include drift losses (probably very small for your tower) and blow down.  Blow down is simply a purge of tower water to prohibit the buildup of solids.
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