^{DIAGRAM OF COMPLETE SET-UP FOR A SUCTION (VACUUM) FILTRATION}

Vacuum Flask Safety Trap Water Aspirator

(These are already set (The vacuum created

up in the lab. Again by the rapidly flow-

they must be made of ing water causes suction).

thick walled glass!)

This trap will catch

any water that kicks

back if there is an

interruption of water flow.

The proper way to break suction when you wish to stop filtering is to open the screw clamp on the trap. This will minimize the danger of water being drawn back into the filtrate in your vacuum flask. Once the suction has been broken the Buchner funnel can be removed from the vacuum flask (the suction is so strong that it cannot be lifted out while the system is connected). After you have broken the suction, the water faucet can be turned off to stop the flow of water.