They last about a year and then the system warns us to replace them. In this price range we are satisfied with such a frequency. Each set comes with a new quartz tube (which we use), but we're wondering if we can clean and reuse the previous one. I check our well water every few months as we have young children and this keeps it in good condition.
TWTADE/AC 24V 10A Coil Electromagnetic Power Relay 8 Pins 2DPT 2NO+2NC With Indicator Light And Socket Base -YJ2N-LY
9 Review
Adjustable AC Current Sensing Switch: SZC23 No AL-CH Model, 0.2A-30A Range
14 Review
5Pcs 19Mm 12V 24V Waterproof Latching Push Button Switch With Wiring Harness And LED Indicator Light, Pre-Wired SPDT Self-Locking 4 Pin Marine Metal Switch For Boats Cars Trucks (Blue)
22 Review
π NuTone 5901A000 Blower Wheel Assembly: Superior Efficiency and Performance
9 Review