At the end of a flushing the water in the bowl stands much lower than hitherto: at the level of the top of the exit pipe, raising the possiblity that the S-bend will not fulfil its function. There is also a gurgling sound at the end of the flushing process.
if this has just started and operation ok before sounds like the start of a blockage/restriction in drain pipework causing water to fill drainage pipework completely when draining away thus forming a vacuum in pipework which sucks water out of pan plung,rod or jet through drain as required
tony,tsp heating
July 2007
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