The seal, or the flapper in the toilet needs to be replaced every 5 to 7 years. This could occur much sooner if chemicals are used in the tank, such as chlorine tablets, or cleaners. When you notice the toilet is becoming harder to flush it is better to check the flush valve seal, or flapper sooner rather than later. If the seal appears to have a curve or bend to it than it would need to be replaced. The flush valve is made to sit on top of the seal not over. When the seal is bent it causes a suction between the seal and flush valve. This would cause you to apply more force on to the handle in order to flush the toilet. If the seal or flapper are not replaced the end result will be wasted water, or a broken lever.
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