Toilet flapper leak

Had a leak and thought I had fixed it. Neither the flapper or the shut off were working properly and the toilet *ran* constantly albeit slowly. Replaced the shut off assembly with a newer type and everything worked fine, for a while.
Then the flapper started leaking again. Replaced the whole assembly but it still trickles causing the water to go on and off every 10 minutes or so.
Am I missing some routine toilet problem? The new flapper assembly seems a bit on the cheap side, are they prone to leakage? TIA for any help.
Frank
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Did you clean the inlet that the flapper valve mates with? Use steel wool to remove any crud on the inlet which could interfere with a good seal.

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Wa6tkq wrote:

Did that. It has a tapered rubber seal. Looks to me like if *that* were the problem area, it would leak to the outside instead of trickling down the inside of the bowl.
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"F.H." wrote:

Upon closer inspection, seems not. I'll try an R&R, maybe needs to be tighter.
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I prefer to use a piece of nylon stocking. Removes the crud without deforming the surface face. And I prefer to use a "Korky" flapper. Still not more than a dollar.

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F.H. wrote:

overflow pipe? The end of it is not below the full water level is it? It it is there will be a slow siphon that gives you the same symptoms.
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Do you put those toilet bowl cleaning blocks (donuts or whatever they're called) in the tanks? I think Lysol and Clorox makes them - maybe some other brands. They'll eat the flapper in no time.
Kim

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