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repeating for persistent foam
Quickly kills bacteria and controls algae for crystal-clear water
and X series filters
For trouble-free pool and spa cleaning
Stingl Switch Vacuum Safety Release System 120/240V SR500 bullfrog repeating for persistent foamStingl Switch Vacuum Safety Release System 120 240V SR500 The Stingl SR 500 Safety Vacuum Release System (SVRS) is designed to provide a critical layer of safety for your pool or spa by actively monitoring the vacuum on the suction side of your pump. When a blockage occurs such as at the main drain or skimmer the SR 500 detects the sudden spike in vacuum, instantly shuts down the pump, and can activate an optional audible alarm for immediate alert.