The western toilet is designed so that it flushes once in a continuous flow after a person uses it. This ensures that any excrement is washed away. However from a fiqhi perspective it is known that for urine a object must be washed twice with a break(water stops flowing) in between washing. If one flushes a toilet which only leaves one continous flow is the water after the flushing considered najis?

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The water inside the toilet bowl is najis once the water stops flowing. The reason is the fact that it is connected to a P-trap, which is not pure. Although you don’t see what’s in the P-trap if you study hall toilet work, you will understand that the P-trap area is always going to have remnants of najasah