Prefiltering?

[Jim Schumacher]

I use orlon cone filters. What is the purpose of prefiltering? Thanks

[dschultz]

To get any debri out of the sap before you cook it,so it goes into the cooker clean

[Gary R]

Too prevent your Orlon filter from clogging to soon. They are about $1 each. They are washable also. I use one for a season.