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For some time appear at the bottom of my pool, polyester shell, rusty spots in several places. Stains like a green bean 5 to 6 cm long and 4 to 6 mm thick. How to make them disappear?

You do not specify the origin of the water in your pool. The phenomenon usually occurs with drilling water that is too rich in iron. Several solutions for treating these spots exist and are likely to give satisfaction, including the use of diluted hydrochloric acid, after, of course, emptying the pool. It must then be filled with water from the network and not from the borehole (if this is your case) It seems prudent to involve a pool specialist, who can propose the most suitable solution, and without risk of damage to the hull. polyester.

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