Ok, this claim just came across Facebook -- that one can save $160USD by peeing in the shower. Certainly, peeing in the shower is both more green and will in fact save water, especially if you let the urine go down drain using gravity rather than water. However, what kinds of parameters would have to be true to save $160 a year by urinating in the shower?
You can also see the claim sort of explain on designtoimprovelife.dk. I'm not sure if that's a valid source, or just advocates of shower peeing. Here is how they explain this bold claim:
Your water savings will depend on how many people live in your home and how much water your toilets use. If you are in Northern Europe, there are generally three different types of toilets: 12 liter flush toilets (oldest), 9 liter flush toilets (older) and modern 2-flush toilets (3 liters and 6 liters). So if you have a family of 5, using modern toilets, you would save 8,200 liters ($60) per year if everyone peed in the shower once a day (4,5x5x365). If you have older toilets, the savings can be over 20,000 liters ($160) a year, but at that point you would probably save more money by buying newer toilets.
At $160/yr of savings, I may very well just ask all of my guests to urinate in the shower instead. This claim just sounds unreal.