Davey ProMatic 24, Installation & Operating Instructions Manual

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19
DAY TO DAY OPERATION
Please observe the following in order to keep your chlorinator running efficiently and maintain unit life.
Free Chlorine
(ppm)
pH Total Alkalinity
(ppm)
Calcium
Hardness (ppm)
Stabiliser (ppm) Salt Level
(ppm)
Ideal reading: 1 - 3 7.2 - 7.6 80 - 120 Concrete/Tiled
Pools: 200-275
Other Surfaces:
100-225
30 - 50 > 4000
To increase: Increase output
of chlorinator,
add chlorine or
increase filtration
time
Add Sodium
Carbonate
(soda ash)
Add Sodium
Bicarbonate
(baking soda)
Add Calcium
Chloride
Add Cyanuric
Acid
Add Salt
To decrease: Decrease output
of chlorinator or
reduce filtration
time
Add
Hydrochloric
(Muriatic) Acid
Add
Hydrochloric
(Muriatic) Acid
Partially drain &
refill pool with
lower hardness
water to dilute
Partially drain
& refill pool to
dilute
Partially drain
& refill pool to
dilute
Testing freq: Daily Weekly Weekly Weekly Weekly Weekly
FREE CHLORINE
Free chlorine is the single most important factor in pool water sanitisation. It represents the amount of
disinfecting chlorine available to keep your pool sanitary and should be tested daily using a DPD test kit or
similar. It is recommended that you keep the level of free chlorine in your pool between 1 and 3 ppm.
Free chlorine is consumed by sunlight and by breaking down organic material in your pool. The level which
you need to maintain depends on how often your pool is used. That is, if your pool is used regularly by many
bathers a higher free chlorine level will need to be maintained. If your water starts looking dull or slightly
cloudy try using a higher free chlorine level. It is important that you do not allow free chlorine to become too
low, otherwise you run the risk of algae growth and the pool may become unsafe to swim in.
STABILISER (OUTDOOR POOLS ONLY)
The importance of pool stabiliser (cyanuric acid) cannot be overemphasised. It is essential in helping to
retain chlorine in your pool. Chlorine is rapidly dissipated by sunlight and the use of stabiliser will reduce this
loss substantially. Without stabiliser, it may be necessary to run the chlorinator for up to three times as long.
Measure the stabiliser level by using an appropriate test kit. It should be between 30 to 50 ppm. If the pool
has never had stabiliser added, then 50 ppm should be added (500g per 10,000 litres, 1.1lbs per 2642gal of
water). Follow the directions provided by the chemical supplier for dosing instructions. Measure the stabiliser
level after backwashing and correct if necessary.
PH AND TOTAL ALKALINITY
A correct pH level must be maintained to prevent problems such as black spot, staining and cloudy water.
An incorrect pH level can damage the pool. Correct pH levels are as follows:
• Concrete & Tiled Pools: 7.4 - 7.6
• Other Surfaces: 7.2 - 7.6
If you allow the pH level to rise to 8.0 or above the chlorine required could be as much as three times the
normal amount due to the chlorine being less active at high pH levels. To lower the pH level, add hydrochloric
(muriatic) acid. To raise the pH level, add sodium carbonate (soda ash).
Total alkalinity should not be confused with pH, although the two are closely related. Total alkalinity
determines the speed and ease of pH change. Having the total alkalinity within the recommended values
buffers the pool water against rapid fluctuations in pH. The ideal range is 80 to 120 ppm, or as recommended
by your pool professional. To lower the total alkalinity, add hydrochloric acid (a little at a time). To raise
the total alkalinity, add sodium bicarbonate (baking soda). Please handle acid with caution and follow the
chemical supplier’s instructions for dosing your pool with Acid.
You should use a test kit which includes a test for total alkalinity. Low total alkalinity can cause unstable pH
levels, which can cause staining, etching and corrosion of metals. High total alkalinity will cause consistently
high pH levels and increase cell scaling.