Welcome to Plbg.com Welcome to the Popular Plumbing, Kitchen, Bath Advice Site
  We're sponsored by:
Buy plumbing supplies online
www.PlumbingForum.com
THE Dynamic Plumbing, Kitchen and Bath, Information, Advice and Sharing Forum


Over 525,000 Posts in over 155k Threads

The most popular positive STRICTLY PLUMBING INFORMATION SHARING FORUM board on the Net. Ask any toilet, sink, faucet, pump, water quality and other plumbing related questions here. Plumbing professional and DIY tips, tricks, shortcuts, remodeling, plumbing advice forum and blog. Please refrain from asking business, pricing, contractor referrals, legal or any other non strictly plumbing related questions keeping all positive and with no advertising. 

New TopicSearchLog In Newest Messages
 Why would kitchen sink vent pipe get clogged?
Author: Anonymous User

The context: Double sink, with a garbage disposal, PVC 1.5 inch piping under the sink.

All started a while ago.

First, dishwasher or sink would occasionally not drain but I could force it through by running garbage disposal with lots of hot water and other sink plugged, which effectively used it as a pump forcing lots of hot water into the drain.

Second, septic smell started appearing right after dishwasher cycle started. Never after or before that. I started wondering if we are having a went problem as the plumbing book was saying that vents prevent traps from loosing water and letting septic gasses going up the pipe. Still not fatal.

Today, lost drain big time. Garbage disposal leaked, water everywhere, lousy picture. Blamed old disposal, thought it lost the seal. Went to the local store and got a straight PVC extension with a slip joint to replace a t-junction that connected disposal into the drain. I thought to reconnect one sink straight into the drain, and leave the other sink waiting for the new disposal to come in.

Now it gets interesting, connected everything together, opened water and nothing goes out of the drain. Took everything apart (full of water), got a manual 20 feet snake and fed it all the way into the drain. It came clean and fine. Since the kitchen is connected to the same drain the nearby bathroom is using, and there are no problems in the bathroom, I thought that chances of a far away blockage were small. So, I remembered about the septic fumes and thought that no venting could also prevent water from reaching the drain, and I fed the snake up into the vent, went halfway with some getting stuck here and there and pulled it out to inspect. To my big surprise, the snake came all covered in sludge big time.

At this time I will reattempt to feed the snake in there again.

Big question, what's going on? Why is the vent pipe is sludgy? Was I forcing the water into the vent and it deposited disposed garbage into it? And, really, what should I do now?

Update: after some fishing with the snake in the vent, I've tried to run water again and it drains now. Don't know about the smell as it requires the disposal to be working, and I am waiting for a replacement unit now. Still, why sludge in the vent? Do I have a bigger problem I am missing?



Edited 1 times.

Reply To This Message

 Re: Why would kitchen sink vent pipe get clogged?
Author: hj (AZ)

The disposer acted as a pump. so it would push 'debris' up the pipe, but it would normally only accumulate in a horizontal line, which you might have if the vent has to offset past a window. A plugged vent ONLY prevents drainage if there is also a plugged line downstream, which is probably your real problem.

Reply To This Message

 Re: Why would kitchen sink vent pipe get clogged?
Author: Anonymous User

Right, there is a horizontal piece to avoid a window right above the sink.

So, the plan is to wait until the drain clogs again (hopefully eventually but not soon) and use a longer snake that time. Meanwhile, stop using disposal to flush through minor clogs as it pushes debris in the wrong place (the vent).

Reply To This Message


Note: Inappropriate messages or blatant advertising will be deleted. We cannot be held responsible for bad or inadequate advice.

Warning: Plbg.com has no control over external content that may be linked to from messages posted here. Please follow external links with caution.

Plbg.com is strictly for the exchange of plumbing related advice and NOT to ask about pricing/costs, nor where to find a product (try Google), nor how to operate or promote a business, nor for ethics (law) and the like questions.

Plbg.com is also not a place to ask radiant heating (try Heatinghelp.com), electrical or even general construction type questions. We are exclusively for plumbing questions.

Click here to view our old forum messages



to: Contact Us
to: Plumbing Manufacturers Address Directory
to: Plumbing Links Site
to: How to show an image
to: theplumber.com
to: Plbg Statistics
to: our FAQ's
to: Advisor List
to: Common Plumbing Terms
We're sponsored by:
Buy plumbing supplies online
  We're sponsored by:
Buy plumbing supplies online

Copyright© 2014 Plbg.com. All Rights Reserved.