8
Volume (cubic metres) x Target concentration (ppm) x Correction
factor
The maximum ozone output of the HG-1500 is 1g per hour when fed by oxygen, this is
equivalent to an output of 16 milligrams of ozone per minute, or 7.8 millilitres of ozone per
minute. The output of ozone expressed as a volume is especially useful for estimating fumigation
times since 1 millilitre of ozone dispersed in 1 cubic metre of air is equal to 1 part per million of
ozone. Knowing the generator output and volume of the space to be fumigated it is possible to
estimate the time required to reach the target concentration:
Time (mins) =
The correction factor is applied to allow for ozone consumed or lost during the fumigation
process. This factor will depend on the amount of oxidisable material present as airborne and
surface dust or dirt and will typically vary between 2 & 10 according to conditions. In small
spaces, the output of the HG-1500 may be reduced to increase fumigation time.
In all but the smallest fumigation volumes, some form of air circulation will be necessary to
evenly disperse the ozone around the space. This can be achieved with a suitable low-speed
oscillating fan.
Typically, sterilising reasonably clean water requires a concentration of between 0.5 – 1.0
milligrams of ozone per litre of water maintained for at least 5 minutes. However, sterilising
water heavily contaminated may typically require concentrations of 2.0 - 3.0 milligrams of ozone
per litre of water and may also require longer treatment times, such as in the case of bore or well-
water contaminated with soluble iron or magnesium salts. Heavily contaminated water can be
successfully managed with relatively low ozone concentrations using extended or continuous
treatment.
For disinfecting spas and swimming pools, effective ozone concentrations may range between
0.1 – 1.0 milligram of ozone per litre of water, according to the total amount of oxidisable
material suspended in the water. Efficient ozone treatment for pools and outdoor spas therefore
depends on removing excess organic solids from the water. This is achieved with efficient
filtration and regularly removing the in-fall of leaves and other organic matter that enters the
water.
Note: Waters with a high pH (alkaline) reduce the effectiveness of ozone and these waters should
be adjusted with acid or buffer to a pH less than 7 before treatment.
