No less then 3" unless your using a sewerage ejector
the ocean. All drains lead to the ocean
Your toilet gurgles when the washer drains because there is a blockage or restriction in the plumbing system, causing air to be sucked in through the toilet's trap. This can create a gurgling sound as the water drains from the washer.
Toilet bubbles when the sink drains because there is a blockage in the plumbing system that is causing air to be trapped and released through the toilet. This can be a sign of a clog or ventilation issue in the pipes.
The toilet drains slowly when there is a blockage in the pipes, a clog in the toilet trap, or a malfunction in the flushing mechanism.
I have seen both.
The drain is plugged somewhat between the upstairs and downstairs. Need to snake the drains.
To prevent toilet bubbles when shower drains, ensure that the plumbing system is properly vented and free of blockages. This can be achieved by regularly cleaning and maintaining the drains and vents in your home. Additionally, consider installing a backflow preventer to help prevent water from flowing back into the toilet when the shower is running.
Clean drains,toilet bowls,etc.
When your toilet bubbles while the tub drains, it is likely due to a clog in the plumbing system. The air trapped in the pipes is trying to escape through the toilet, causing the bubbling. This can indicate a blockage that needs to be cleared to prevent further issues with your plumbing.
Improper venting.
When the washing machine drains, it can cause the toilet to overflow because both appliances may share the same drain line. If the drain line becomes clogged or blocked, the water from the washing machine can back up into the toilet, leading to an overflow.
Toilet bubbles when the tub drains can be caused by a clog in the plumbing system. When water is drained from the tub, it creates a vacuum that can draw air from the toilet, causing bubbles to form. This indicates that there is a blockage in the pipes that needs to be addressed to prevent further issues with the plumbing system.