Before replacing the siphon, pour about 1/2 litre of water into the siphon, so that urinal remains be flushed away. In case it is needed, use a little plastic bag. Take a multigrip pliers and place its jaws into the opening of the siphon. Turn the pipe clockwise around until it engages. Now turn siphon towards the top and pull it out. Lay siphon down and pour remaining liquid from the siphon into the drain. Put used siphon into a plastic bag and throw it away into the plastic garbage. (The siphon is made of recyclable polyethylene).
      Relax since your balance sheet, your guests and the environment benefit from Waterless.

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