The drain for the lavatory is usually connected to the toilette soil pipe. The lav. drain is either plastic or brass so peeing in the sink is safe for the system.
Just run the water for 2 or 3 seconds, full blast after you urinate to clear the trap.
What you are doing is very common.
Urinating in washroom lavatory (sink) to save money on water usage
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The drain for the lavatory is usually connected to the toilette soil pipe. The lav. drain is either plastic or brass so peeing in the sink is safe for the system.
Just run the water for 2 or 3 seconds, full blast after you urinate to clear the trap.
What you are doing is very common.