Hard Water Problems
Hard water deposits can also be a cause of a blocked toilet. Build-up can occur over time and calcify in the walls of your pipes. The hardness of your water is related to how many minerals are present in it.
Blockages in other Water Lines
Sometimes, the cause of the blocked toilet is not the toilet itself. Sometimes, a blockage in other wastewater carrying lines, which can affect the entire system, has occurred. It can consequently cause a blocked toilet. Roots entering your drains are the most common cause, and depending on the type of tree, can re-grow into a cracked pipe or pipe joint within 3 to 6 months.
Older and damaged pipes can also create blockage problems. One of the first signs of a collapsing piping system is sediment backwash. Slow drains in the toilet as well as other drains in your home are signs of a much larger problem. Rough edges of a drain pipe break can catch waste material from the toilet, causing repeated blockages until the drain is repaired.