Noisy pipe issue needs solving

[SM1559]

I have noisy pipe issue. See attached photos.


When the water flows from the floor above into the straight down into the waste pipe, when it reaches the bottom of the bend, you can hear the noise. What is the best solution to stop this noise?

1. Add more bends to the pipe and if so where is best to add the bend/s? See attached photos showing 3 possible options which we have drawn. Please advice.
2. We will also box the pip, add sound Acoustic foam and put as many plaster boards possible once a best solution is found.

Please advise and refer to attached photos for info.

Thank you in advance.

 

[rpm]

Add sound proofing and box it in.