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                           عمومی:: 
                            سیستم ایمنی آزاد سازی خلاء
                        
                        A Safety Vacuum Release System (SVRS) is required for all pools, whirlpools, water features or fountains that presently have a single main drain installed.
All newly constructed pools, whirlpools, water features or fountains must be designed without the need for a Safety Vacuum Release System (SVRS).
 
                        
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