The Swish and Dump Technique:

Transferring the sample to the filter funnel


Remember to first turn on the water faucet. This produces suction that will help keep the filter paper from floating during the filtration process.

 


 

First vigorously swirl the mixture in the flask.

This mixes the contents of the flask and insures most of the solids will be transferred to the filter apparatus. Make sure the aspirator is turned on and don't delay to the next step!

 

 


Quickly dump the mixture into the Buchner funnel

A common mistake made by students is to be too careful while dumping the mixture into the funnel. Consequently, much of the desirable solid remains in the original flask and is not transferred to the filter paper. Swish and dump means...swish and DUMP QUICKLY before the solid has the chance to settle.

 

 

 

 

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