Hayward EZ-CHEM Guide De L'utilisateur page 18

EZ-Chem is a device for regulating the pH of your pool.
With the addition of an ORP kit (optional), it can also regulate both the pH and the liquid chlorine injection to provide you with a complete
treatment.
EZ-Chem can treat pools up to 90 m 3 .
Disconnect the pool filter pump before starting the installation. The installation must be carried out in accordance with the standards
currently in force in the country. The control box must be mounted a minimum horizontal distance of 3.5 m (or more, if required by local
regulations) from the pool and within 1 m of a protected outlet.
Preparing the water in the pool
To prepare the pool water, its chemical composition must be balanced. Certain adjustments to the chemical balance of the pool can take
several hours. It is therefore necessary to start the procedure well before switching the unit on. Non-compliance with this procedure may
trigger the device alarm (Alarm band, OFA alarm, etc.)
Chemical water balance
The following table summarizes the concentrations recommended by Hayward. It is important to maintain these concentrations to prevent
surface corrosion or deterioration and to derive full benefit from your pool. Control your water regularly. Your authorized Hayward dealer
or pool suppliers will provide you with the chemicals you need, together with instructions on how to use them, to adjust the chemical
balance of the water in your pool.
Free chlorine
pH
Cyanuric acid
(Stabiliser)
Total alkalinity
Water hardness
Saturation index
Saturation index
The saturation index (Si) gives us information about the calcium content and alkalinity of the water; it is a water balance indicator. Your
water is correctly balanced if the Si is 0 ± 0.2. If the Si is below -0.2, the water is corrosive and the coating on the pool walls may be
damaged. If the Si is above +0.2, stains may appear. Use the following table to determine the saturation index.
Page 4 of 13
CHEMISTRY
1.0 to 3.0 ppm
7.2 to 7.6
20 to 30 ppm (preferably 25 ppm)
Only add stabiliser if necessary
80 to 120 ppm
200 to 300 ppm
-0.2 to 0.2 (preferably 0)
Si = pH + Ti + Ci + Ai - 12.1
°C °F
12 53
16 60
19 66
24 76
29 84
34 94
39 100
Use: Measure the pH of the pool water, the temperature, the water
hardness and the total alkalinity. Use the table above to determine Ti,
Ci and Ai in the above formula. If the Si is equal to 0.2 or more, stains
may appear. If the Si is equal to -0.2 or less, corrosion or deterioration
may occur.
CORROSION
USE ONLY HAYWARD GENUINE REPLACEMENT PARTS
GENERAL
INSTALLATION
RECOMMENDED CONCENTRATIONS
Hardness Total
Ti Ci
(calcium) alkalinity
0.3 75 1.5 75
100 1.6 100
0.4
125 1.7 125
0.5 150 1.8 150
200 1.9 200
0.6
250 2.0 250
0.7 300 2.1 300
400 2.2 400
0.8
600 2.4 600
0.9 800 2.5 800
- 0.2 0 0.2
STAIN
OK
EZ-CHEM
Ai
1.9
2.0
2.1
2.2
2.3
2.4
2.5
2.6
2.8
2.9
Rev. C