| 摘要 |
This invention discloses an in-situ process or method for cleaning the interior surfaces of a swimming pool or the like for removing stains, scale, calcium deposits, and the like, and without the need for draining the pool. The chlorine content of the pool is initially tested, and chlorine is added to bring it up to a level sufficient to prevent algae growth for a period of up to 10 days without filtering. Water is added to the pool to insure all water line marks are sufficiently immersed so as to benefit from the cleaning operation. An acid wash solution, including a mixture of hydrochloric acid and a strong metal chelating agent, is then applied in-situ or as close to the surfaces to be cleaned as possible. As the stains, scale, and deposits dissolve, a strong organic acid such as oxalic acid is added to precipitate out the undesirable materials and cause them to settle down to the bottom of the pool for subsequent vacumming. The pool is then vacuumed and backwashed to totally remove the precipitates from the system, and the pH is then raised by adding sodium carbonate. Finally, a strong metal chelating agent is added to stabilize the pH in a desirable range of from 7.2-7.6 and to prevent redeposits from forming after the cleaning operation is complete.
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