Plumbing Questions? Ask a Plumbing Expert.
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Your description indicates you have a stoppage in the toilet bowl. You can try plunging the bowl but if you don't have a professional quality plunger already then the best tool for the job is a closet/toilet auger (see attached pic). The auger will clear most stoppage even when a plunger won't. You can get a decent quality one at the big box stores or a good hardware store. Let me know if you plan on buying one and I'll pot instructions on how to use it here. Your only other option is to call a plumber.