: After the toilet is flushed it fills the bowl up with water to the appropriate level. However, the water in the bowl slowly starts to disappear! It takes ~20 minutes for this to occur. It never goes low enough for the vent gasses to enter. The water level in the tank remains the same.: There is no water on the bathroom floor, nor is there any water in the basement near the toilet.: I attempted to snake the roof vent above the toilet with a garden hose – but this did not help.: I did notice that the bathroom sink was partially clogged a couple of days prior. This was corrected though.: Any suggestions are appreciated… Thanks.Sounds like a partical blockage . Do you hear a gugling sound when you flush or let the Basin water down?
