Last summer I heard a loud dripping sound. I did some investigating and found that the condensation line going from the AC unit in the attic drained into a pvc pipe that had a trap at the bottom. The water fell about 8 feet to the water in the top of the trap, which echoed through the pipe and was loud enough to wake you up at night. The washing machine discharge also leads into this pipe, so what I did (which was a quick fix and worked pretty well) was place a sock on top of the discharge line, so the water would fall from the condensation line in the AC unit, hit the sock, the sock would soak, and then the water would fall.
I figured the sock probably wasn't a good idea, so I wanted to run flexible tubing directly from the condensation line down. At first I wanted the tubing to go all the way into the water line at the p trap, but when the hose was below the waterline the condensation line stopped draining and started to back up (i'm not sure but I may have discovered some sort of new fluid dynamical property- will look into it later). I cut the hose so it ends above the water line, but now I'm back to the dripping sound problem. The sound comes out of the opening that the washing machine discharge hose sticks into. I brought back the trusty sock and wrapped it around the discharge hose that sticks into the opening, which muffled the sound, but I'd like to get rid of the sock entirely. What's the correct way to solve this problem?