First, remove the dirt covering the water pile directly above the first pipe entrance to navigate it there. Let all the water launch out of the pipe, come through the loop and into the poison. Send the poison to the second pipe entrance and let it launch out of the pipe and clear the algae. Once all poison has been launched, drain it to the right of the screen. Then send the other water pile down to the first pipe entrance and let the pipe launch it, then send it down to the second entrance and uncover Swampy's shower pipe to get the water there and win the level.