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Bryan

01-30-2009 04:16 AM

explain PPM

Could you explain PPM. I do understand that it is parts per million but the meter that I am Using
reads from 6 up to 40. What is the comparison.

Ron	01-30-2009 04:17 AM

Conductance is expressed as a "Mho." Since such conductivity is small, it is expressed as
"milliMhos/cm," a measurement of conductivity through one cubic centimeter of solution. The desired
range is generally 2.0 to 4.0, depending on the stage of plant growth and vigor. This is from
Hydroponic Home Food Production.

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