Malfunctions of the treatment facilities may often occur. For this, a check of the hydraulic and filtering system of the pool may be required, so before the start of cleaning, engineering diagnostics is needed. Then you need to drain all the water, but you should not wait for the moment when the surface becomes dry, so as not to engage in «irrigation» again. Gently peel the tiles and seams can only be with a damp surface of the walls. The walls of a long dry pool must be re -pouring water. Special acid -containing products are used to remove plaque and dirt. For their application, you will need a gun that creates a foam. When trying to pour the product on the surface, the acid simply drains down, not having time to react with the surface layer. Unlike walls, a rotary machine is used to clean the bottom. After cleaning, dirty water is pumped out with a water -cost. Further, they start polishing metal elements — stairs and handrails. To do this, use algicide that excludes the appearance of algae.