IPS Controllers M920 - Introduction; Water Chemistry

M920 & M920W pH/Dual ORP Controller Owner’s Manual
I. Introducon
A. Water Chemistry
Water chemistry is a complex science that contains many variables.
These variables not only aect the water environment itself, but they
can have adverse eects on your equipment as well as your health.
These are only some of the factors which we follow closely to ensure the
most healthy water interacons:
pH is the measurement of the acidity or basicity in an aqueous soluon.
A measurement below 7 is considered acid, while a measurement above
7 is base or alkaline. It is a signicant factor in determining the water
quality as it aects sanizer levels, water color, and human reacon to
the water.
ORP (Oxidaon Reducon Potenal) is the measurement of the oxidizing
capacity present in water. ORP cannot be fooled by the eects of pH,
total dissolved solids (TDS), stabilizers, and non-chlorine oxidizers.
A typical ORP sensor measures Hypochlorous Acid (HOCI), which is
the more eecve component of free chlorine. A higher ORP reading
equates to the sanizer working more eecvely.
Water balance is comprised of pH, calcium hardness, total alkalinity,
temperature, and TDS. When water is balanced, the Langelier Saturaon
Index is 0. Values above +0.3 lead to scaling and cloudy water, while
values below -0.3 can cause corrosion of pool equipment and surfaces. If
the water balance is not xed in a mely manner, secondary eects can
lead to rapidly declining water condions that can aect the health of
the water occupants.
pH and ORP work conversely to one another, and are aected by other
factors such as temperature, Cyanuric Acid, and TDS that can increase
the negave impacts of unbalanced water.
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