When I flush my toilet, the water continues to drain out until the level is very low and there is a loud glugging noise (presumably due to air getting in because the water is so low). This gradually refills so that the next time I use the toilet, the water level is normal. The toilet cistern is built in so not an easy job to open it up to have a look at what might be going on. Any ideas what is going on and what can be done?
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