CONTROL OF ALGAE. The aim of algae treatment is to take measures to prevent undue proliferation rather than to eradicate existing growths. If algae are allowed to develop more or less unrestricted drastic action may become necessary. Always remember that an ounce of prevention is worth a pound of cure. Where algae has been allowed to gain a foothold it may become necessary to drain the pool so that the sides can be scraped down and the algae destroyed by spraying with a 5% solution of copper sulphate or a 10ppm chlorine solution. To keep any algae in check it is suggested that the water in the pool should be given a shock dose of about 10ppm of chlorine once every month. Copper sulphate can also be used to control algae. Where only isolated areas of algae are noted a bag attached to a rope and containing copper sulphate can be dripped into the pool onto the algae and allowed to stand for several hours. Copper sulphate has the following disadvantages:
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