Reply To: When I turn on the bathroom sink, the toilet fills with water…

[SelgasParticipant]

Ya could have a small or partial blockage on the toilet waste pipe that is causing water to back up under high water flows from the handbasin.
Would suggest you get the waste pipe from the toilet end checked out.

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Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians