Your home’s plumbing system is more complex than just the visible pipes and drains. Vent stacks are hidden within the walls and roof and serve two crucial purposes. First, they allow wastewater and sewer gasses to exit the home. Without this vent, these gases would seep out through drains, filling your home with odors. They also allow clean air into the plumbing system to help water flow smoothly through the pipes. Imagine drinking a beverage with a straw. If you put your finger over the top of the straw, the liquid stays put even when you stop sucking. But when you remove your finger, air enters the straw, and the liquid flows freely. Similarly, a plumbing vent allows air to enter and equalize pressure in the pipes. Without this air, water would not flow quickly, leading to slow or clogged drains.
So, how does a clogged vent stack lead to toilet problems? Just like how covering the top of a straw hinders liquid flow, a blocked vent stack can hinder water flow in your pipes, leading to slow drains or frequent toilet clogs. When the vent is clogged, it can create a vacuum in the pipes. As a result, when you flush the toilet, the water doesn’t have enough force to move with the waste through the pipes. Instead, it struggles against the vacuum effect, resulting in poor flushing or back-ups.
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