USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
7
Pool Chemistry
Now that your new controller has been physically installed, water chemistry should be tested and
adjusted prior to initiating automated control of the pool or spa. Confirm that your pool or spa water
conforms to the following ranges before powering on and setting up the HCC 2000.
The table below indicates generally accepted guidelines. Always maintain water chemistry accord-
ing to standards set by your local or State Health Department.
Test Minimum Ideal Maximum
pH 7.2 7.5 7.8
Free Chlorine (PPM) 1 2 3
Bromine (PPM) 2 3 4
Cyanuric Acid (PPM) 0 - 100
ORP (mV) 650 - -
Total Alkalinity 80 - 120
Calcium Hardness 200 - 400
Hayward water quality controllers maintain sanitizer levels (chlorine, bromine, ozone, etc.) based
on ORP. Although ORP is a superior index of water quality compared to part per million sanitizer
residual levels, factors such as pH, cyanuric acid concentration and total dissolved solids can affect
sanitizer residual readings relative to ORP.
Hayward strongly recommends establishing desired pH, sanitizer residual, calcium hardness, total
alkalinity, temperature and cyanuric acid levels prior to initiating automated control of the pool or
spa. The ORP setpoint will need to be changed periodically as described later in this section if the
goal is to provide consistent sanitizer residual levels rather than consistent control of ORP.
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