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Swimming pool chemical dosing rates

The enjoyment and safety of your swimming pool and spa bath depends to a great extent on the correct additions of chemicals to the water. Below are the calculators to allow you to rapidly work out how much of each chemical to add to water of known volume. See also:

WATER VOLUME CALCULATOR

This should be your starting point, if you don't know how much water there is, it is impossible to calculate the correct additions.

WATER BALANCE CALCULATOR

This calculator will tell you whether your water is likely to corrode your pool or cause cloudy water and scale precipitation.

INDIVIDUAL PRODUCT CALCULATORS

Please click on a link below.

Predissolve dry materials and predilute liquids before distributing around the pool. Allow sufficient time for thorough mixing before retesting.

What about pH? Unfortunately, there is no easy way to calculate additions for this as there are so many variables. Our best advice would be to ensure that you have the total alkalinity level correct. If it is too high, above 200 p.p.m, then the water will be excessively buffered and it will be difficult to adjust the pH. If it is too low, less than about 80 p.p.m., then there may be large fluctuations in pH for small additions of correction chemicals. With the total alkalinity about 100 to 140 p.p.m. predissolve small quantities of pH INCREASE or pH DECREASE and distribute around the pool. Allow up to 12 hours with pumps running to fully mix and then retest.

BUY pH INCREASE

BUY pH DECREASE


TOTAL ALKALINITY

This is a measure of the alkaline nature of the water, which at the pH encountered in swimming pools is predominently bicarbonate. As with most things to do with pool chemistry there is a compromise situation between corrosion, scaling, sanitiser efficiency and ease of maintaining pH. The range to aim for is 80 to 150 p.p.m.

Note: Trichlor will lower total alkalinity
Calcium Hypochlorite will raise total alkalinity
Dichlor will have least effect on total alkalinity.

To raise total alkalinity add TOTAL ALKALINITY INCREASE.
To lower total alkalinity add pH DECREASE or fresh water

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY TOTAL ALKALINITY INCREASE

BUY pH DECREASE


BROMINE TABLETS

A Bromine tablet weighs about 18 gms. As these slowly dissolve the free bromine level will rise as indicated by this calculator In spa baths and small domestic pools, maintain a free bromine level of 2 to 3 p.p.m. In larger more heavily used pools, or commercial pools where the bather load is higher, aim for 4 to 6 p.p.m.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY BROMINE TABLETS


CALCIUM HYPOCHLORITE

These are unstabilised Chlorine granules, also known as "Shock Chlorine". As a routine sanitiser, Calcium Hypochlorite is usually preferred for indoor pools where the effects of sunlight are less. When used outdoors, a separate stabiliser must be added to slow chlorine loss in sunlight. For sanitising, the typical free chlorine level would be 2 to 3 p.p.m.for domestic pools, 3 to 5 p.p.m for heavier used pools. 10 p.p.m or more is the shock treatment level, following which, the level should be allowed to drop below 5 p.p.m before bathers enter the water.

TIP - Add shock chlorine at night so that it can work in the dark to maintain its strength for longer.

TIP - In soft water, Calcium Hypochlorite also builds the Calcium content of the water.

NOTE - At free chlorine levels above 10 p.p.m, the water sample colour using Phenol Red test tablets may be bleached. This could give the impression there is no chlorine when there is quite a lot.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY CALCIUM HYPOCHLORITE


DICHLOR

Dichlor is an abbreviation of the chemical name Sodium Dichloroisocyanurate Dihydrate. (UK Approved Supply List - troclosene sodium dihydrate) It is also referred to as Stabilised Chlorine Granules. It provides an easy way to add chlorine to outdoor domestic pools where the stabiliser resists the chlorine loss caused by sunlight. The typical free chlorine level would be 2 to 3 p.p.m. Dichlor is not ideally suitable for "shocking" or "Superchlorination" For this purpose we recommend Calcium Hypochlorite

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY DICHLOR


TRICHLOR

Trichlor is an abbreviation of the chemical name Trichloroisocyanuric Acid (UK Approved Supply List - trichloro-1,3,5-triazinetrion). It is supplied in slow dissolving tablets of 200gm for most pools or 20gm for use in small pools and spa baths. It provides a very easy way to add chlorine to outdoor domestic pools where the stabiliser resists the chlorine loss caused by sunlight. The typical free chlorine level would be 2 to 3 p.p.m. Not suitable for "shocking" or "Superchlorination". For this purpose we recommend Calcium Hypochlorite. This calculator shows the grammes of tablet used for each p.p.m free chlorine.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY TRICHLOR


HARDNESS INCREASE

The principal water hardness salts are Calcium Carbonate and Magnesium Carbonate. Usually tests for hardness express the result as mg/litre (parts per million) all as Calcium Carbonate. If there is too little in your water then calcium salts from concrete, tile grout and other metals in the pool structure will dissolve in it. Soft water is therefore corrosive. Too much on the other hand will form scale. Generally the water should be kept at around 150 p.p.m as Calcium Carbonate unless your pool supplier recommends otherwise based on how it is constructed. If your test shows additions should be made, use Hardness Increase as as indicated by this calculator.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY HARDNESS INCREASE


CHLORINE STABILISER

Where unstabilised forms of chlorine such as Sodium or Calcium Hypochlorite are used outdoors, it is necessary to add a separate stabiliser to slow the rate of chlorine loss. For free chlorine levels above 2p.p.m., aim to achieve a level of 50-100.p.p.m. Too much however can cause a condition known as "chlorine lock" when the free chlorine is inhibited in its action as a sanitiser. In this case it should be lowered by dilution with fresh water.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY CHLORINE STABILISER


HIKLEAR ALGICIDE

A copper based algicide used throughout the summer to suppress the growth of algae into the pool. Shock treat the pool with Calcium Hypochlorite and then maintain a residual copper content at 0.4 to 0.5 p.p.m.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (ml)

BUY HIKLEAR ALGICIDE


POOLKLEAR ALGICIDE

A premium copper based long life algicide used to suppress the growth of algae into the pool. Shock treat the pool with Calcium Hypochlorite and then maintain a residual copper content at 0.4 to 0.5 p.p.m.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (ml)

BUY POOLKLEAR ALGICIDE


POOLWATER FLOCCULANT

This measures a suitable dose of positively charged polymeric material which which will assist the negatively charged particles which cause haze to agglomerate together and be more easily removed by filtration.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (ml)

BUY POOLWATER FLOCCULANT


ALUMINIUM SULPHATE

For more information on using this product, first see our Use and Safety Page. This calculator is used if you are adding 20mg/litre.

Volume
in Litres
Increase Required
ppm (mg/lt)
  Dose (gm)

BUY ALUMINIUM SULPHATE


HEXAQUEST

Softens water and prevents scaling and staining of spa baths by chelating the hard water salts present. A typical dose rate would be 100gm per 1000 litres

Volume
in Litres
    Dose (gm)
 

BUY HEXAQUEST


OXYGEN SHOCK

An alternative shock to chlorine based materials, allowing bathers to return to the water sooner. Oxygen Shock is particularly recommended for use with Bromine tablets. Dissolve the required amount in 50 to 100gm quantities in water. Distribute evenly around the water area.

Pool Dose Rate: 300gm per 25,000litres

Spa Bath Dose Rate: 30gm per 1000 litres

Pool Dosage (300gm per 25,000litres)
Volume
in Litres
    Dose (gm)
 
Spa Bath Dosage (30gm per 1000 litres)
Volume
in Litres
    Dose (gm)
 

BUY OXYGEN SHOCK


QUATKLEAR - Non Copper Algicide

A low foam, polyquaternary algicide used to suppress the growth of algae into the pool. This is a copper free material. Shock treat the pool with Calcium Hypochlorite and then use as indicated by the calculator.

Initial Dose
Volume
in Litres
    Dose (gm)
 
Top-up Dose
Volume
in Litres
    Dose (gm)
 

BUY QUATKLEAR


SCALE CONTROL

This products inhibits the precipitation of hard water salts which can cause scale and cloudy water.

Initial Dose
Volume
in Litres
    Dose (gm)
 
Top-up Dose
Volume
in Litres
    Dose (gm)
 

BUY SCALE CONTROL


WINTER CONDITIONER

A blended threshold chelate and low foam polyquat sanitiser to inhibit the precipitation of hard water salts and to provide a broad spectrum sanitiser for over winter conditions. Use at the rate of 3 litres per 25,000 litres. If algae are a particular problem, then Poolklear Algicide may additionally be added, although it should be noted that if scale exists on pool surfaces some copper staining may occur.

Volume
in Litres
    Dose (gm)
 

BUY WINTER CONDITIONER


SPA ANTIFOAM

A white silicone emulsion to control foam in spa baths. Used weekly or as required at the rate of 50ml per 1000litres. For an initial dose, use twice the regular dose shown by this calculator.

Volume
in Litres
    Dose (gm)
 

BUY SPA ANTIFOAM


 
 

 

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Confederate Chemicals Ltd., Mochdre Industrial Estate
Newtown, Powys, SY16 4LE, Wales UK.    Tel: 44 (0) 1686 627158    Fax: 44 (0) 1686 627580

Copyright Confederate Chemicals Limited 2002