Originally Posted by freelancer66040
Hi - I have been having problems with my kitchen sink draining extremely slow. If I put any chemicals down the drain, there is no effect. I checked the trap and it is clean. If I clear it with a plunger it works great, completely drains and runs great for about 30 seconds and then backs up again. I'm wondering if this could be an airlock. This drain is from an old farm house and I believe that it is just gravity fed out to our ditch. I'm not sure if this is related, but last summer, we had a leak around one of the drain baskets and I replaced it. Unfortunately, the local hardware store had a different depth to the one in stock that the one I replaced. So my lateral drain pipes are uneven. Could this be causing an air lock?