Bjorn,
I think you might be trying to say that water has that "effect on you." Effect can be either a noun or a verb. As a noun, it means the result of something You were saying that the effect of water is to make you relaxed and it sure is true. I have a hard time getting up from my chair by the pond once I settle in to relax. It makes me feel lazy! The word like "effect" is "affect," which is usually a verb. it means to bring on or cause a change, or to cause emotion, to provoke feelings (good or bad). it can also mean to adopt a false characteristic. You would say you had a hard day at work and went to your pond. You were affected by the sound of the water and the effect of the sound of the water was to make you relax. I hope I haven't confused you more. Those two words are often used wrong even in our country so I googled them to make sure I told you the correct information. Again, your english is so good I certainly knew exactly what you were saying.
Casey