Concentrated Blue Copper Algicide 0.5 litre x 6

Algicides are a vital ingredient to control the nuisance of algae in swimming pool and spa water.

Algae are microscopic single cell plants. They exist in most water, from fish tanks to reservoirs. Whilst not directly harmful, they are undesirable in swimming pools as they discolour the water- usually green, which is most univiting to the swimmer. Eventually the water can become opaque and dangerous in that a bather in difficulty may not be seen. The pool structure will also be slippery if algae are attached to it.

Nitrogen can be introduced into the water by bather contamination. Shock treatment, itself a good method of killing algae ensures that some nitrogen is released as a gas rather than staying in the water as an assortment of nitrogen compounds.

Phosphorus can is introduced into the water in a variety of ways. Phosphorus will eventually revert to orthophosphates which is what algae really likes.

HOW TO ELIMINATE ALGAE

• Shock dose by raising the free chlorine level to above 10 parts per million if the water is a greenish colour and up to 25 parts per million if you can't see the bottom. This treatment should be done whilst bathers are prevented from entering the water. 
• Brush algae from the structure of the pool. The more virulent types such as black and mustard varieties may need scraping off. Vacuum and remove these residues by the pool filtration.
• Introduce algicide into the water. This will most likely be in the form of copper chelate which slowly releases copper into the water, hence the term "longlife algicide". Aim for an intial free copper level of 0.8 p.p.m and maintain at 0.4 parts per million. Don't overdo it, otherwise copper may start to deposit on metal surfaces and it may turn your hair blue! Or use the alternative non-copper type.