Water Testing
Here at Pool Supplies we have professional water testing facilities, which can calculate the chemical levels of your pool water in just 60 seconds. If you are experiencing problems with your pool water or you would just like us to perform a regular water analysis, then visit our shop and we will test it for you for free. If you are unable to wait around for your test results, then we will email them to you, it’s that simple.

To perform a water analysis, we would need you to sterilise a container, and then fill it with your swimming pool water (always take water samples away from pool filtration return lines to ensure accurate readings). Then simply bring your sample into us as soon as possible, so that we can perform an accurate analysis.

All of the chemical products we sell will have a dosing chart printed on the label of the bottle or container.  However, in order to apply the correct dose to your pool, you will need to know how much water you are dosing.  To calculate the approximate number of gallons of water in your pool, the following calculations can be applied:

For rectangular pools:
Length in feet  x  Width in feet  x  Average Water Depth in Feet  x  6.25
So.... 30' x 15' x 4' x 6.25 = 11,250 gallons

For round pools:
Diameter in Feet  x  Diameter in Feet  x  Average Water Depth in Feet  x  4.9
So.... 12' x 12' x 4' x 4.9 = 2,822 gallons 

Chemical Handling Advice:

Chemical Safety  

Further Reading

For more information on how to look after your pool, please refer to the following three PDF documents.

Blue Horizons Pool Care Guide

The complete guide to maintaining your pool

Problem Solving & Maintenance

A maintenance chart and troubleshooting guide

AquaSparkle Spa Care Guide

The complete spa care guide

Below you will find recommended plant configurations based on various pool types and sizes.

Suggested plant for above ground pools

Suggested plant for in-ground pools


Maintaining healthy water (above ground pools)
If you are experiencing problems with your pool water, then we can help.

Green Pools

To maintain healthy pool water, you will need a variety of items.

Chlorine Tablets - We recommend the Blue Horizons ultimate floating dispenser 720g, they are simple to use, and will last up to 3-5 weeks. This product is suitable for pools up to 5,000 gallons (22,700 litres). Inside the device is a solid block of chlorine, of which has a built in algaecide and clarifier – this helps keep your pool sparkling clear and helps cut down the amount of chemicals needed to maintain your pool. The chlorine levels should be kept between 1-3ppm (parts per million). (For larger pools there is a 1.5kg dispenser available).

Shock Chlorine - We recommend the Fi-Clor Superfast Shock Chlorine (shockpot), this is a fantastic product for boosting your chlorine levels up to kill bacteria and help control algae. It is currently the most powerful stabiliser-free chlorine currently available in the UK. It can be dosed directly into the pool as it dissolves rapidly. This product can also be used as a regular sanitizer, to help maintain crystal clear water.

Water Test Kit – We recommend the LaMotte Insta-Test 3 Plus test strips, they come in a pot of 50 and can test for Free Chlorine, Bromine, Alkalinity and PH. Simply take a test strip, dip it into the water, take it out and wait about 20 seconds, then compare the colours from your test strip to those on the side of the pot, it’s that simple.

PH Plus – PH Minus – After you have completed a water analysis, it will tell you what your PH levels are, if the PH levels are too high, you will need to purchase some PH minus, if they are too low, you will need to purchase some PH plus. PH is important; it should be tested and corrected at least once a week, PH is the measure of how acid/ alkaline the swimming pool water is. A PH of 7.0 is neutral – below 7.0 is acidic, above 7.0 is alkaline. The PH of our eyes is 7.2, no wonder that the ideal PH for your pool is just that – 7.2, and should be kept within the range of 7.0 - 7.6.


 Alkalinity – Alkalinity keeps the PH under control and makes sure it doesn’t bounce all over the place (A measure of the ability of the water to resist pH change). The Alkalinity should be kept at around 80-120 ppm (parts per million). In above ground pools (easy set/ metal frame) this isn’t really a necessary product to use, you would just need to be concentrating on the chlorine and PH levels.

Water Problems