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Jeff Wisnia wrote:
wrote:

The bowl in one of my commodes fills up to it's normal line, but the
water in the bowl gets lower in about 30 minutes. The tank is filling
up fine. I replaced the flapper, but the problem continues. Any
suggestions. Thank You. AY

Look for a clogged vent associated with that toilet. A partial vacuum
may be being created when other devices drain, which is sucking the
water out of that toilet through it's trap.

Try flushing other toilets and running water in sinks while someone
watches the affected toilet's bowl level. That may give you a clue.

Jeff

And if it still drains out slowly when no other fixtures
have been used, there may be a flaw in the bowl passage,
allowing leakage to the drain or even leaking into the floor.

Much less likely, a string or similar is stuck in the bowl
outlet and is "siphoning" water out along the string.

Jim