Let the left-hand pool down to the opening. The water will fill the duck on the left and then merge with the purple sludge. Allow the sludge to go down the opening beneath (in the process, dig out the object to the upper-left of this opening), which will kill the plant growth. Drain this purple sludge, then head back up the screen. Release the remaining water and guide it to the 2 ducks, then to the shower pipe opening.
See Next Level’s Solution:
Where’s My Water Meet Swampy Level 1-15 Solution: Conveyor Belt
See All Where’s My Water Solutions:
Where’s My Water Solutions/Walkthrough/Cheat