I've searched old threads on this but was hoping for a little more direction. We likely need to call a plumber -- just want to be prepared. We have a newly-constructed house and have been in it about 4.5 months. In the past couple of days, the sink in our 1/2 bath has started gurgling when the toilet in that powder room is flushed. This is not happening anywhere else in the house. We are on a septic system, and I feel confident that our venting is adequate and per code. I just don't know why this would start now, or so soon after we've taken occupancy. Should we expect the problem to be in the toilet/closet flange, or possibly in the vent stack? I think all the bath vents tie into a central vent that exits the roof. I guess it's *possible* that something got in the main vent and found its way to the vent that comes from this 1/2 bath? The toilet works fine, and if you run water in the sink prior to flushing the toilet, it doesn't gurgle. The sink doesn't drain slowly, either. This is just a powder bath, and there are only two people here. It's not as if it gets a lot of use from a lot of people... Anyway, just hoping for some "where to look" advice, in the event there is a DYI solution. I did use a plunger in the toilet, but that wasn't effective.

My bathtub faucet is not turning smoothly and although applying WD-40 into the cracks helped a little, I was thinking about removing and cleaning/replacing the cartridge for better results. After reading a few online posts, I understand that the cartridge is usually secured to the wall plumping with a C-clip, but I did not notice one on my faucet, maybe because my tub is an older installation and different. I've taken some photos and I was wondering if anyone was familiar with how to remove the cartridge on such a faucet? Thanks!