pH control of your swimming pool
Total Alkalinity is the measurement of the amount of alkali (in the form of carbonates,
bicarbonates and hydroxides) present in your pool water.
It plays an important part in
the control of your pool’s pH level.
If the Total Alkalinity is too low rapid changes
of the pH level can result, causing corrosion and unsafe or unpleasant swimming conditions. High Total Alkalinity is not as
great as a concern although it does make adjusting the pH level difficult. The most likely problems are cloudy water and limescale.
Total Alkalinity, like calcium hardness, can be easily measured with a pool testing kit. Ideally you should
aim for a level between 80 and 140 mg/l (ppm).
New marbelite, concrete and tiled pools
may produce a higher than average T.A. reading during their first two years due to a leaking of carbonates and bicarbonates
from the materials used.
Remember that keeping Total Alkalinity at the right level, as
well as protecting the swimmers, will ultimately prevent your pool from corroding or deteriorating, and make pH control easier.
Adjust Total Alkalinity as follows:
Add to Water
To increase TA
TA Plus /
0.8 / 45m³
Total amount required may be added to pool in one dose.
To decrease TA
to lower TA by approx.
6 mg/l (ppm)
Reduce in stages until correct TA is obtained.
Your pool should now be ready for swimming.
The next step is keeping your
pool-water in great condition.
Disinfection (or sanitisation) is the process of removing harmful bacteria, and possible sources of infection
from the water.
In other words it is the method you can use to guarantee your pool water is clean and safe. Even if the
pool is not regularly in use and the water looks clear, if left untreated bacteria can easily build up and cause possible
Here is a guide to the options you can take to maintain your pool water. The
recommendations here are for outdoor and indoor pools. The water condition will change due to the level of usage, the amount
of backwashing and topping up that you do and the weather.
Super Stabilised Chlorine Granules
Soft & Easy
The most commonly used chemical for disinfection is chlorine. Bromine, (the main brand is Aquabrome)
is also widely used, in conjunction with a slow erosion feeder (Brominator). Chlorine free treatments are rapidly gaining
in popularity. For example active oxygen has advantages for the pool user over traditional chlorine. It has a much gentler
effect on the skin, minimising odours and offers a more environmentally friendly system.
Sticks and other multifunctional products are designed to last longer than the traditional tablets and need checking weekly
and replenished as necessary.
It is advised that whatever system you use the disinfection
product is checked every week, and you record your results (see Swimming pool maintenance charts on pages 10 and 11). Each
product shown here comes with a group of complimentary products as a part of a total water care system. Further information
on all these products is freely available at your local Sunspot dealer.
(SUPER STABILISED CHLORINE GRANULES)
Liquid chlorine (SODIUM HYPO)
51% available chlorine
14-15% available chlorine
65% available chlorine
90% active ingredient
6 to 7
2 to 3
10 to 12
6 to 7
|Dosage rate for shock treatment|
per 50m³ (11,000 gallons) gives 1 mg/l (ppm) rise in chlorine
tablet feeder or skimmer 2×225g tablets per 50m³ (11,000 gallons)
75g per 50m³ (11,000 gallons) gives 1mg/l (ppm) rise in chlorine
Use bromine feeder
1 double sachet
per 20m³ (4,400 gals weekly)
|Recommended for shock
Use Bayrol Bayro shock
4ltr per 50m³ (11,000 gallons) will give 10mg/l
(ppm) rise in chlorine
750g per 50m³ (11,000 gallons) will give 10mg/l
(ppm) rise in chlorine
If you find that
you have put too much chlorine into the pool, the addition of Sunspot Chlorine Reducer (Sodium Thiosulphate) in the recommended
quantities, will get the levels back to normal. Sunspot Chlorine Reducer also works when bringing down high bromine levels.
From time to time pool-water
can become cloudy. This is sometimes caused by particles too small to be removed by the filter (dust, dirt, etc).
The addition of a Super Water Clarifier, Granular Floc or Sparkle Tabs, will get your pool-water looking clean
and clear again.
Flocculant tablets should never be added to skimmers when chlorine tablets
are in use. Flocculant tablets should be put into the pump basket in this situation.
Scale and metal deposit prevention
Sometimes a build up of metal
or scale impurities can lead to discolouration or cloudiness of your pool-water and surrounds.
Metals will cause the following colour
Maganese - Brown/Black
Copper - Blue/Green or Dark Brown
Iron - Light
Zinc - Off White
Using a sequestering agent such as Conquest or Stain &
Scale inhibitor will remove these impurities.
Shock treatment restores water clarity and removes any organic waste which can produce
unpleasant smells or lead to eye and skin irritation.
This treatment is intended to complement
your regular water treatment programme – be that a traditional sanitiser (chlorine or bromine) or the active oxygen
adding chlorine regularly to your pool-water will kill bacteria and keep most algae growth at bay, occasionally some may still
appear in the pool. This can be countered by using one of the algaecides in the range. Persistent algae growth will usually
only be a problem if your pool is not being treated and tested regularly.
From time to time grease, scale and other contaminants will build up
in the filter. Regular use of a filter cleaner will prevent the growth of harmful bacteria and generally keep the filter clean.
The domestic pool should be backwashed weekly as part of your maintenance routine. Once backwashed the addition of a flocculant
or water clarifier will give you sparkling water.
Tile band cleaning for
Cosmetics and body oils may form a dirty mark around the waterline
area of your pool. A regular clean with a Waterline Cleaning Paste or Tile and Liner Cleaner will keep the sides of
your pool grease free.
Do not use household cleaning products as they can react
with pool water disinfectants.
By keeping the area around your pool clean you will reduce the amount of dirt and harmful bacteria
that is brought into the pool by it’s users; making it easier to keep the water clear and healthy. The use of a hard
surface cleaner such as Sunspot Springclene is recommended.
In all pools there will always be some loss of water through evaporation. However, if you find
there is some leakage from the system (either from the liner, concrete or pipe work) there are easy to apply leak sealers
you can use which are very effective and come with comprehensive instructions. It is worth bearing in mind, however, that
these products are designed for minor leakages only. If problems with your pool persist contact your local dealer for advice.
Remember to read all chemical product labels and follow directions for use