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Pool Chemical Advice

Water Problem Solving Chart 

Are you having problems with your pool water? If so check out the problem and symptoms in the table below.

Green / Cloudy Water / Slippery Sides Algae Shock dose with chlorine (see start up dose) and add Algaecide
Too much chlorine Overdose Allow time to naturally dissipate or buy a chlorine reducer
PH hard to control Alkalinity low Seek advice on how to raise total alkalinity
Can't maintain chlorine levels Chlorine demand of water too high up start up, after holidays or due to excess contamination or neglect Shock dose with chlorine (see start up dose). Repeat after 24 hours if necessary
Cloudy water Poor chemical control or inadequate filtration Clean cartridge, check chemical levels with Dip Test Strips and adjust if necessary (chlorine/PH). If problem persists buy a Pool Clarifier to remove small particles
Rough pool sides / edges Scale formation due to high calcium levels in water Ensure PH levels are correct using Dip Test Strips and use a Pool Scale Inhibitor to stop calcium precipitating out of water
No colour change on test strip dip test Too high chlorine leading to bleaching of indicator pads (over 15ppm chlorine) Check expiry date on Pool Test Strips. Wait for chlorine level to drop and re-test
Foaming Detergent present from incorrect cleaning products or excessive algaecide use. Reduce water level and top up with fresh water. Avoid domestic household cleaners.

General Safety Tips

  • Do not leave non swimmers / children unattended
  • Do not overload the pool
  • Avoid sitting on pool walls
  • Do not allow diving in shallow water
  • Do not use during thunder storms
  • Do not use electrical appliances near water
  • Use plastic rather than glass around the pool
  • Have a First Aid Kit available for any accidents

Chemical Handling

  • Read instructions thoroughly on each product/box before use
  • When pre dissolving chemicals always add chemicals to water and not vice versa
  • Never mix different chemicals in concentrated forms including these kit products but also with other products like bleach or weedkillers – a dangerous reaction may occur
  • Always pre dissolve chemicals in a clean,plastic container in a well ventilated area
  • Avoid spillages but in event of spillage clean up using clean receptacles anddispose in the pool. Flush cleaned spill areas with water
  • Never use unlabelled chemicals
  • Wash hands after handling pool chemicals

Storing Chemicals

  • Store chemicals well away from children and pets
  • Store in a secure,cool and dry place

Starter or Shock Dosing

Use ClearWater Dip Tests to test the water supply for pH and Total Alkalinity levels.At this stage the water is unlikely to have much chlorine (if any),so to avoid algae and bacteria from the start add a "shock” or starter dose of ClearWater Stabilised Chlorine Granules. 
Allow 50gms of chlorine granules to 1000 gallons (4545 litres).

Most above ground pools now include a pump and cartridge filter as standard.It is a combination of circulating water through the cartridge to collect suspended particles,together with good chemical water treatment,that helps you maintain clear, clean and healthy water. As a guide to running circulation,you should aim to "turn” the full volume of pool water through the cartridge once per day. Typically in most splash pools, using standard equipment,this is 4 hours per day (that the pump should be turned on).

Using ClearWater 3 way dip Tests you are able to quickly and accurately assess the condition of your water and make adjustments to chemical levels with the appropriate chemicals added where necessary. Test daily when the pool is in use and twice weekly when the pool is not is use.
Free Chlorine 1 - 3 ppm* *ppm = parts per million
pH 7.2 - 7.6  
Total Alkanlinity 125 - 150 ppm* *ppm = parts per million

 When using ClearWater Dip Tests follow the instructions on the bottle for best results being observant of the optimal reading times and always holding strips level (to avoid indicator pad colours mixing).

By regular testing of pool water you will soon learn how various activities like refilling, topping up, adding chemicals and general usage can affect various test readings.

Chemical Water Treatment

Bacteria Control – ClearWater Stabilised Chlorine Granules are used to disinfect the pool water and keep it free from bacteria, some of which may be hazardous to health. ClearWater Chlorine Granules are quick dissolving and relatively pH neutral.

Normal Dosing - ClearWater Stabilised Chlorine Granules:
1000 Gallons (4,545 Litres) 9 Grams
2500 Gallons (11,364 Litres) 23 Grams

 To ensure the ideal reading of 1 – 3 ppm is maintained it is advised to aim for 3 ppm to provide a useful "buffer” for fluctuating conditions such as bathing loads and hot weather. The rate of chlorine consumption can and does vary depending on different conditions and chlorine will be consumed even when there is no swimming (i.e. by sunlight or by algae). Because of this,the only way to be sure that there is chlorine present in the water is to test regularly.

pH – The pH scale of 0 – 14 measures acidic or alkali conditions respectively.The middle reading of 7 is neutral, so pool water with a pH below 7 is acidic and pool water with a pH above 7 is alkaline. 

For above ground pools the ideal pH level is slightly alkaline between 7.2 – 7.6, ensuring plant protection and bather comfort are maintained (the pH level of the eye is consistent with this level).



Skin / eye irritation

Scale formation

Reduces chlorine effectiveness

7.2 - 7.6 IDEAL LEVEL



Plant corrosion especially metals

Unpleasant smells and bather discomfort

Chlorine quickly used up


If the pH of your pool water is above 7.6 then use ClearWater pH Minus to reduce it,using the application instructions on the bottle.

If the pH of your pool water is below 7.2 then use ClearWater pH Plus to increase it,using the application instructions on the bottle.

Algae Control

Algae are microscopic forms of plant life that can multiply quickly in untreated water, turning clear water to "pea soup” in a matter of hours. Chlorine used in pools helps prevent algae,but extra protection using ClearWater Algaecide really is both prudent and cost effective. Dose as per bottle instructions.

1000 gallons (4,545 litres)



2500 gallons (11,364 litres)




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Cleaning & Maintenance

Periodic cleaning of waterline grease,steps and pool equipment will not only make your pool look good but it will optimise the use of your chemicals during a swimming season.

Use pool preparations when cleaning areas around swimming pools since household cleaners often contain phosphates which nurture algae growth or detergents which cause foam.

Working Out Pool Volumes

Working out pool volumes can be tricky when considering how much chemicals to add to your pool. On most pool instructions the typical measurement will be provided in US gallons. See the table below for a typical guide:

10 ft diameter x 30 inches deep

800 UK Gallons (961 US Gallons)

3639 Litres

12 ft diameter x 30 inches deep

1183 UK Gallons (1421 US Gallons)

5377 Litres

15 ft diameter x 36 inches deep 2240 UK gallons(2689 US gallons) 10,179 Litres
15 ft diameter x 42 inches deep 2720 UK gallons(3266 US gallons) 12,362 Litres
15 ft diameter x 48 inches deep 3038 UK gallons(3648 US gallons) 13,807 Litres
18 ft diameter x 42 inches deep 4203 UK gallons(5046 US gallons) 19,100 Litres
18 ft diameter x 48 inches deep 4661 UK gallons(5596 US gallons) 21,182 Litres


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Chemical Treatment Summary 

A quick guide to products needed for treatments:


1 - 3 ppm (aim for 3) ClearWater Stabilised Chlorine Granules

Daily when pool in use to maintain ideal levels

pH 7.2 - 7.6

ClearWater pH Minus to reduce

ClearWater pH Plus levels to increase

Weekly or as required to maintain ideal levels

Prevent Algae

n/a ClearWater Algaecide


See our full range of Pool Chemicals


Material Safety Data Sheets

Chemical PDF Download
CH0003 Clearwater 2kg Multifunction Tablet (2018) Download
CH0004 Clearwater 5kg Chlorine Granules (2018) Download
CH0005 Clearwater 1kg Ph Increaser (2018) Download
CH0006 Clearwater 1ltr Algeacide (2018) Download
CH0007 Clearwater 1ltr Antifoam (2018) Download
CH0008 Clearwater 1.5kg Ph Decreaser (2018) Download
CH0009 Clearwater 1ltr Clarifier (2018) Download
CH0010 Clearwater 1kg Chlorine Granules (2018) Download
CH0012 Clearwater 25 Test Strips On Blister Card (2018) Download
CH0017 Clearwater Half Size Pool Starter Kit 25 Test Strips On Blister Card (2018) Download
CH0017 Clearwater Half Size Pool Starter Kit Chlorine (2018) Download
CH0017 Clearwater Half Size Pool Starter Kit Ph Decreaser (2018) Download
CH0017 Clearwater Half Size Pool Starter Kit Algaecide (2018) Download
CH0017 Clearwater Half Size Pool Starter Kit Ph Increaser (2018) Download
CH0018 Clearwater Half Size Spa Starter Kit Antifoam (2018) Download
CH0018 Clearwater Half Size Spa Starter Kit Ph Decreaser (2018) Download
CH0018 Clearwater Half Size Spa Starter Kit 25 Test Strips On Blister Card (2018) Download
CH0018 Clearwater Half Size Spa Starter Kit Chlorine (2018) Download
CH0018 Clearwater Half Size Spa Starter Kit Ph Increaser (2018) Download
CH0019 Clearwater 1kg 20g Multifunc Tablets (2018) Download
CH0020 Clearwater 1kg 200g Multifunc Tablets (2018) Download
CH0021 Clearwater 1ltr Stain & Scale Remover (2018) Download
CH0022 Mini Qik Tablets (2018) Download
CH0023 Clearwater Prefilled Pool Floater (2018) Download