All water fittings in a bathroom must be supplied via an appropriate and adequate form of backflow protection, one which is rated either equal to or higher than the highest downstream contamination risk (fluid category) for the type of backflow (back pressure or back siphonage) it is likely to be exposed to.
A toilet is considered to be a fluid category 5 risk.
Typically, toilets have built in fluid category 5 protection such as a Type AUK1 backflow arrangement, but if not, they need to be supplied via a suitable backflow prevention arrangement offering fluid category 5 protection.
As some backflow prevention arrangements and devices have operational limitations you should always check with the local water undertaker to make sure they are suitable for the intended application.
For further information contact the local water undertaker.
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