I too use a shop vac, but made an extension of 3/4 " pvc on the end of a
blower attachment, a slip fit, (on the vac side). Then reduced the 3/4 to
1/2" at the end. This slowed down the process, got more debris, less water.
Placed the vac on a small stand so I could empty the vac into a strainer,
i.e. milk crate w/ some fabric DW got somewhere, kinda like cheesecloth, but
holds up well.