Poolmaster 22280 5-Way Test Kit - Manual (Page 6)

4
TOTAL ALKALINITY
It is important not to confuse total alkalinity with
pH. Total alkalinity refers to the quantity of alkaline
materials in the pool water, while pH measures the
balance point between these alkaline materials and
acidic materials. Total alkalinity could be too high or
too low even if pH was normal.
High alkalinity may cause cloudy water, calcium
deposits on pool walls and pipes and irritation
to the body tissues of swimmers. Low alkalinity
may cause eye irritation and corrosion of pool
equipment.
Swimming pool water is most satisfactory when the
total alkalinity level is between 80 and 100 ppm. At
that level, the alkalis help stabilize the pH and allow
the chlorine to do its job.
Once the proper level of alkalinity is achieved, it will
hold steady for weeks without further treatment,
although it is recommended that test readings be
taken a least twice a month.