There is no such thing as a refill tub BUT there is a refill TUBE to replenish the trap seal and help in scouring action
The water in the toilet bowl is drained during flushing to remove waste and refill the bowl with clean water for the next use.
The flush valve in a toilet system is responsible for releasing water from the tank into the bowl to remove waste and refill the bowl with clean water after flushing.
The water in your toilet moves due to the flushing mechanism that helps to remove waste and refill the bowl with clean water.
Sounds just like frozen piping
To remove toilet bowl cleaner stains from the tub, you will need hot water and a sturdy brush. Get the brush wet and use elbow grease to clean the stain.
To effectively empty a toilet bowl for thorough cleaning, start by turning off the water supply valve located behind the toilet. Next, flush the toilet to remove most of the water. Use a plunger to push any remaining water down the drain. Then, use a toilet brush and a cleaning solution to scrub the bowl thoroughly. Finally, flush the toilet again to rinse and refill the bowl with clean water.
That device is called the refill tube. This allows water to go down the overflow tube to refill the water closet bowl while the tank is filling.
The water in your toilet moves because of the force of gravity and the design of the toilet's flushing system. When you flush the toilet, water is released from the tank into the bowl, creating a siphon effect that pulls waste and water down the drain. This movement helps to remove waste from the bowl and refill it with clean water for the next use.
Check the tank and make sure it's full. Check the flapper and make sure it moves enough to drain the tank into the bowl.
The refill tube may not be connected properly or the holes around the flushing rim need to be cleaned
The clog is below the point where the toilet and the tub join the drain.
15 inches from outside edge of tub to center of toilet flange.