Maintaining and using your pool equipment properly is crucial to longevity, have you thought about the sun beating down on your digital screen of the chlorinator? are you constantly letting your pool water level get too low and your pump shuts off? What about backwashing your filter, do you do this on a regular basis? In general we mainly see pool equipment needing changing due to age.
When we regularly service your pool, we monitor the equipment and if we think you might be up for a new cell as we can start to see degrading, we let you know and quote you so you can start saving for a replacement, while sometimes these things still happen suddenly, if we can we let you know in advance, no one likes that kind of surprise.