I removed the spray bar from the Eheim 2213 input tube and allowed the water to flow in without it attached. I did this because the spray bar seemed to cause more turbulence in the water----actually it caused a whirl pool which I did not like----too much water movement on the surface. As anyone esle experimented with moving the input tube and found one system is better than another. There are so many water filtration systems on the market and I am not sure what type of "entry" system is best aquatic plants. I certainly don't want my plants in a whirl pool or under a water fall. I thought about adding a larger size diameter tubing to reduce turbulence----or do I want turbulence for better water filtration????