fill it up with clean clear water to replenish the seal
trap seal loss or poor venting
toilets have a built in water trap And they should be properly vented to prevent trap seal loss
Same thing
Trap seal loss occurs when you have poor venting and as one fixture drains it creates negative pressure created and it pulls the trap seal (water) from another trap and allows sewer gases to enter the structure
By cutting it out and installing either a P trap or a running trap as an S trap is notorious for losing its seal
Check your flame trap first for a clogged trap.
2"
They can also require to have a self primming trap
there are 100 inches in a trapseal
A net fishing rod by hands a spear by boat a trap
you put a blanket on the trap but not the door open the trap then get back as far as possible.
Evaporation is the most common, syphoniage due to no vent or a block went is another cause or a leaking trap.