The Polylok™ filter alarm panel and switch provides a visual and audible notification of impending filter and tank servicing. Our Patented SmartFIlter™ control switch attaches to Most Polylok™ Filters and All Zabel & Best Filters. The filter alarm switch activates when the filter cartridge is near capacity on solids that have built up through the filtering process. The filter alarm switch sends a signal to the alarm panel activating the septic tank alarm. The owner will need to call a local septic service company for immediate service.