I have 1.6 gal tiolet (eljer) and when u flush there is no back flush pressure to take everything out. i have snaked the roof vent ,changed from the ball to a new water flow mec,put a new flapper. if u dump 1 to 2 gallons of water in the bowl it flushes perfectly,so i figure that there is no drain problems plus the tiolet on the other side of the wall different brand flushes just fine
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The roof vent for the toilets is shared. It is the pipe (on the roof) that lets water in the drain system. When clogged, it causes what you have. A garden hose placed in the roof vent (and turned on) may clear the blockage (could be leafs or pine straw or a dead bird). Needs to be cleared... I have used a plumbers snake with 100% success....but you may not have one...so the garden hose suggestion. Be careful on the roof.
It could be a venting issue. Check the roof vent for the plumbing system. Perhaps clogged with leaves or other debris causing a blockage in the vent line. You can use a hose up to the roof and flush out the vent line. Another problem may be calcium buildup. CLR , a product available at most hardware and grocery stores will dissolve mineral buildups.
If there is a shower in the same bath is it also draining slowly?
If so check that drain systems air vent, (on the roof).
Find the pipe coming out of the roof nearest the bathroom with the problem and when a second person flushes the toilet you should be able to feel
air moving in and out of the pipe with your hand covering the end. If not the vent could be blocked by leaves or animals etc., this vent has to be clear in order for water to drain properly.
This is a job for a plumber unless you have a ladder. The vent pipe may be plugged or the trap in the toilet may be plugged up but this requires removing the toilet from the floor which is not that hard. two floor bolts and and turn off the water valve and disconnect the water hose then lift the toilet up and see if there is blockage by poring a gallon of water into the drain pipe. if it backs up you need to snake out the main line. You can rent a electric 25 foot snake for 35 bucks but then you have to reinstall everything plus buy a new wax ring which is about 5 bucks. if the pipe is clean and drains fine then you need to run water into the toilet outside to clear the throat of the toilet if there is no blockage then the vent pipe may be plugged and that you have to get from the roof. Best bet is call a plumber.
It sounds like your toilet is not vented properly. Either there is no vent pipe (which is not likely since it has worked properly for a while), or the vent is plugged. Possibly an animal or bird has gotten into the vent stack going out the roof of your house and plugged it. When the vent is plugged, the water in a trap or toilet bowl will get sucked out as the water from the flush goes down the drain. I would say to have someone check your venting.
there is no air release. the vent must be clogged somewhere. you can take a hose up there and see if it drains all the way or floods over. since the tub drain has a trap and the toilet itself is a trap, there has to bee a good amount of air pressure coming up without a release. i would say an obstruction. possibly at the junction of the main and the vent.
Mine does this too, from time to time. I've found that it usually means there's a plug somewhere down the line that you can't reach with a coathanger. Since I keep forgetting to buy a plunger, I use a johnny mop to vigorously poke in and out of the bottom hole until most of the water in the bowl is gone. After doing that, a couple flushes usually clears the line.
If that doesn't work, you'll probably need to use a snake on it.
I have found on many occasions this problem was caused by an obstuction in the internal trap of the toilet. Everything from toothbrushes to Batman figurines have been removed from them. If you intend to do the repair yourself you can use a closet augerwhich is a manual cable snake tool that will be inserted into the bowl of the toilet and the cable ran through the toilet's internal trap to clear obstructions. You could also rent a hand held electric auger that is basically a drill with a drum attached with a drum with coiled cable inside that is shoved down the channel the same as the aforementioned product. This device take a bit of finesse and skill as the cable will try to kink and coil up as you go one can get injured doing this. If you find that the toilet is clear of internal obstructions you may have to pull the toilet up as the obstruction may be further down the line. If you rent a medium sized electric auger you can locate the vent stack for the toilet and run your cable down the vent from the roof so you may not have to pull the toilet. This method will only clear obstructions behind the vent connection and not the length from the connection of the vent to the toilet itself. If yo have an elevated house you may have access to a clean out that by most codes are at every change of direction greter or equal to ninety degrees. You also should test your water pressure if all else fails as that specific model must have at least 25 psi at the very least to operate correctly. Hope this helps you out.