The Hissing sound in a toilet does not mean that there’s a snake inside the toilet, the hissing noise can be a toilet that makes noise after flushing or filling it sometimes indicating a leak in the system, a buildup of calcium or other debris in the pipes, It may also be because of the water or air that is moving through the water line and into the toilet tank.
When you hear a hissing sound from your toilet when you flush, it’s safe to assume that the sound is common or the flushing mechanism is malfunctioning in one way or another.
There are so many reasons behind the hissing sound it can be part of the toilet flushing system or it can be malfunctioning on its own. Let us take a look at the flush system found inside the tank and how they produce and make the sound.
FLUSH SYSTEM INSIDE THE A TOILET TANK.
1. Flapper
The toilet flapper noise normally happens in the middle of the night, the toilet suddenly seems to flush on its own, the problem then is that the water in the toilet tank is slowly seeping out, probably through a faulty flapper.
Once the float gets below a certain level the water switches on and voila, the toilet flapper is connected to the bottom part of the flush valve. When the flush valve closes, the flapper blocks the draining hole to keep water from flowing from the tank.
When the flapper is damaged. Similar to a damaged float, the damaged flapper can’t completely shut off the flush valve. Therefore water from the tank keeps on being sent to the commode. and also because of this damage, the float descends opening the fill valve slightly and allowing water into the tank.
To stop the hissing sound if the damaged flapper can not be repaired let it be changed by a professional plumber because it is not repaired or changed it can cause your toilet to constantly run and make a hissing noise also ultimately increasing the water bill
2. Flush valve
The flush valve opens up to release water that will push the waste down from the commode for an easy flow.
3. Fill valve
Normally there are two kinds of valves inside the tank on the back of the toilet bowl. The flapper valve is located at the bottom of the tank which gives access to water to enter the bowl. The other is a refill valve that automatically refills the tank each time the toilet is flushed.
This refill valve may be an older-style ball cock with a stem and a floating ball, a modern tower valve with the float attached to a plastic tower, or even a tower with no moving visible parts.
So as the metal parts of an old ballcock-style fill valve wear out the valve may not open and close normally and therefore the force of water flowing through the aperture can create some disturbing sound effects.
The humming sound which may be almost inaudible at first is the first indication that water isn’t flowing as freely as it should. When the sound turns to annoying screaming, it may mean that metal parts are loose and, if you don’t do something, the valve will probably fail. There is little point in trying to repair such a valve because replacements are inexpensive and also
when the refill mechanism is blocked creating a higher than normal water pressure inside the refill tube. As the high-pressure water passes through a restricted opening, it creates vibrations that you hear as hissing.
This fill valve opens up to allow fresh water to fill up the tank, It has a float attached to it, which goes decent downwards when you flush. As the float goes down, the fill valve is unlocked and water is let through.
As the float floats again, the valve is shut off, cutting the water flow, generally, toilet hissing stems from the fill valve failing to close off completely therefore This problem can affect other parts of the flushing systems.
When debris is stuck inside a fill valve the debris and water sediments may accumulate and get stuck right at the fill valve’s mouth, there as a result, it can’t fully shut off and Water continues to flow through the little opening, causing the hissing sound.
And also a hissing sound can mean that the refill valve is still letting a tiny bit of water into the tank because it hasn’t shut off like it’s designed to do.
4. Damaged float-
the float always sends the signal to the fill valve that it is time to close off but when this float is damaged, its job is stopped as a result the fill valve fails to shut off completely.
5. Water knock or water hammer –
This is a normal frequent toilet noise complaint that can even occur because water is not compressible that it flow inside a pipe and is suddenly slammed to stop while it is running rapidly.
For example when a washing machine valve snaps off or a faucet is closed quickly the momentum of the water causes it to slam forward and bang around and against the sides of the pipe and the inside of the fittings and this causes the hammering sounds so In addition, it can cause the pipes to chatter and vibrate.
When you notice that after flushing a toilet and you find out that there is a loud hammering toilet noise, it can be that it is the sudden stopping of the water flow. But when a new toilet is fixed in a new house make sure you check it around to know if the plumber has mistake exchange or has broken the part of the water tank also when flushing the toilet some sounds do happen naturally, for example, the flow of the water from the tank down to the flushing of the toilet.