Asked in Plumbing
When your water softener cycled why did water come out of your upstairs toilet?
While I have never hears of this situation actually occurring, here is a possible explanation. When a water softener is installed, it creates a small pressure drop in the plumbing. typically a loss of 5-15 psi in water pressure to the home (higher pressure loss when the water is flowing more quickly). When a water softener is cycling (regenerating) it goes into a bypass mode where the pressure loss is removed so during regeneration the water pressure in the home is slightly higher. This slight increase in pressure *might* exlain possible differences in performance of a toilet in the home.