A running toilet is usually caused by a faulty flapper or fill valve, which can lead to water continuously leaking into the bowl. This can waste water and increase your water bill. It is important to fix the issue promptly to prevent further water waste.
Water runs in the toilet bowl to maintain proper water levels and to flush waste down the drain when the toilet is flushed.
The discharge line (soil ) may be slightly back pitched so it takes longer to drain
Run a new cold supply line from the source. This will drain less pressure from the the cold shower line.
The water in the lower toilet is probably being siphoned out of the tank by the negative pressure caused by flushing the upper toilet. This CAN happen if the water level in the tank of the lower toilet is over the top of the ballcock. If this is the case, the tank water is being siphoned into your drinking water! Replace the ballcock with a Fluidmaster right away. If you have a small white fill valve that sits in the bottom of the tank, get rid of it. These are illegal and WILL siphon under these conditions. If the lower toilet runs AFTER the fill cycle of the upper toilet, it may be that the ballcock seals at a lower pressure, and the pressure spike when the upper toilet shuts off causes it to run a bit until the added water closes the valve a little tighter.
The sewer line is blocked. Have a plumber come and inspect your manholes or run some rods down your sewerline from a rodding point to check what is wrong.
check your pressure regulator valve or house pressure .Replace fixture stop and ballcock assy also r&r flapper
Toilet
A toilet may run randomly due to a faulty flapper valve, a leak in the fill valve, or a problem with the float. These issues can cause water to continuously flow into the toilet bowl, leading to a running toilet.
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Toilet Paper
Toilet Paper