Owner`s manual

SECTION 6. PREPARING WATER 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 4000.
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 according 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 Controllers, Inc. 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.