What are the anti-leakage bucket devices?

there is a stool filter. Also called toilet anti-blocking funnel net cover cap, anti-falling cover and anti-debris urinal cover. There are two kinds of anti-suction devices learned in high school: inverted funnel and safety bottle. Anti-suction devices are all used for tail gas treatment. Backwash is due to the fact that the tail gas is easily dissolved in the treatment liquid, and the internal air pressure decreases instantly, while the external air pressure acts on the surface of the tail gas treatment liquid and enters the reaction device along the air duct.