You can hear refilling a toilet sometimes without being flushed.

This sound can occur irregularly and every couple of minutes or hours.

Typically such a refill sound warns you that your toilet loses water either internally 

 or externally if you see water outside the toilet.

COMMON PROBLEMS

• Toilet Running Constantly
• Toilet Is Making Abnormal Noise
• Toilet Tank Won't Fill Up Or Is Slow To Fill
• Slow Fill On A New Performance Fill Valve
• Installing / Adjusting A Leak Sentry Valve
• Choosing The Right Flapper (Flush Is Weak)

Tips for you have to check the former 

• Determining Your Toilet Type
• Determining Water Leaking Into Bowl
• Check Water Hammer And Pipe Knock
• Cleaning A Fluidmaster Fill Valve
• Keeping Your Toilet Clean
• Check If The Bowl Is Overfilling
• Adjustable Flappers Instructions

If you still need a professional plumber to assist you , call Plumbing Houston TX

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