LaMotte Pool Manager Water Quality Handbook - Manual (Page 33)

should malfunction, the air may still be flowing into the
water but without the required ozone residuals. As long
as some ozone is going into the water, most experts agree
that the oxidation process is being properly
accomplished. As little as 0.001 parts per million (ppm)
has been determined to be effective.
How do we test Ozone?
Because ozone is required at
such low levels and it
dissipates in minutes after
being produced, it can be
quite difficult to determine
the ozone content of water.
Most current testing is done
with the DPD test method
which produces a pink color in proportion to the
amount of ozone in the water sample. However, DPD
will also react with any chlorine or bromine in the
water. Often, testing with DPD is sufficient to identify
the total level of the safe combined oxidizers.
Another test method is the indigo-trisulfonate method.
This method is best suited for use with electronic
colorimeters since visual color distinction is extremely
difficult for measuring at the low levels of 0.01 ppm.
Ideal Range for Ozone
0.01 - 0.1 ppm
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