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9
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 CAT 2000.
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
The above table indicates generally accepted guidelines. Always maintain water chemistry accord-
ing to standards set by your local or State Health Department.
All CAT 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.
CAT strongly recommends establishing desired pH, sanitizer residual, calcium hardness, total alka-
linity, 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.
Configuration
Overview
Once desired start up chemistry parameters have been established, you are ready to set the CAT
2000 to automatically maintain pH and sanitizer levels. Please refer to the Illustration on page 12
for controller unit button designations. Button designations appear in bold type.
Basic Configuration Options
Selecting Acid or Base Feed
The CAT 2000 is preset from the factory to operate in the acid feed mode (when pH exceeds the
setpoint, the pH chemical feeder is activated). If the sanitizer used at your facility causes the pH
to decrease you must select base feed mode. To switch the controller between acid feed and base
feed modes, perform the following steps:
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