May 25,2022

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OVER 25kg - £15.75 PLUS VAT.



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Benefits of good water balance

Efficient use of chlorine

Good quality bathing conditions

Less likelihood of pool problems like algae and scale formation

Clear and clean water


Problems assocciated with incorrect water balance

PH Chlorine released slowly. 7.2 to 7.6 Skin and eye irritation, Water will become very acidity, Water will start to be corrosive and start to stain.
Total alkalinity  Scale forming
ph hard to move. Cloudy water likely
80 to 120 mg / ltr (ppm) ph (bounces) around. Water more aggressive. Corrosion more likely in pool.
Calcium   hardness Scale forming min 200mg/I (ppm) and corrosive Water is likely to be aggressive
Cyanuric acid(ppm) Sunlight will destroy
chlorine faster
25 to 30 mg / ltr (ppm) Max level  55 to 60 mg / ltr
Total  dissolved solids Chlorine less effective, can promote scale max 1500mg/I(ppm) No problems


What effects balance

Chemical properties will have an effect on the ph.

Acid rain can reduce the ph.

Water from the mains can be hard or soft depending on where you are in the country.


How to adjust balance

ph 7.2-7.6 to raise use alkali (soda ash)
to lower use acid (sodium bisulphate)
total alkalinity 80-150/I(ppm) to raise use TA Increaser sodium bicarbonate
to lower use sodium bisulphate / hydrochloric acid but need to seek assistance as if done incorrectly could cause bleaching in liner / cover
calcium hardness 200-500/I(ppm)  to raise use Calcium Chloride Flakes
cyanuric acid 30-60mg/(ppm) raise use pool conditioner.
total dissolved solids max 1500mg/I(ppm)

regular backwashing will help keep this in line.


How to test your water

A test kit should be able to help you decide which chemicals need to be added to your water and ensure a perfect harmony is achieved making your pool a safe to relax in. There are three different ways of testing your pool water:

  • Digital water testing - These are more accurate than test strips as long as they are calibrated at least once a year or twice a year if used regularly in line with manufacturers recommendations. Lovibond Checkit highly reccomended for school use, you can order them with us. The important part of digital testing is to keep your test tubes clean and dry while testing and the testing machine in a warm dry environment, as this may distort the readings and give false results

  • Digital test pens - These are very easy to use and ideal for use with Salt Chlorinators and the Zodiac Magna Pool system You can order Digital test pens with us.  Please find below a free testing APP to assist with your daily testing - this app works on the Langelier Scale to help you underststand the readings here is a link to more information -

 Lovibond App


Pool and spa maintenance tips

Problem Solution
Green or cloudy pool water, slimy walls This is normally caused by algae and is easy to treat using a super shock or liquid chlorine (cannot be bought on-line, due to shipping laws, please visit our shop).  A good rule of thumb for dosage of granular shock is 500g per 10,000 gallons or for liquid chlorine 5ltrs per 10,000 gallons. These doses may need increasing if the algae is deemed more serious, ask for advice
Cloudy water or slimy walls This is a build up of bacteria or algae which is easily treated with Granular Spa Shock or Spa Fusion.




Boast Pool Maintenance system

The BOAST System was designed by Blue Horizons ( to aid owners with understanding and applying maintenance products and methods.

Balancers   Balancing your swimming pool water
Oxidisers  Oxidise on a regular basis
Algaecides  Algae prevention
Sanitisers  Sanitise to ensure all bacteria is destroyed

 Test your water on a regular basis to ensure water is safe


Join our New BOAST System of Water Testing Service - the modern computerised water analysis service. Let us test your water using our Total Analysis Programme (TAP). Computerised water analysis has never been so fast and accurate! This service is £10 (FREE on subsequent purchase of chemicals) - just bring in your water sample



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