The home vacuum cleaner does not pull as much vacuum as a tracker bar
pump.  The tracker bar pump pulls more vacuum, something like 80 inches
of water lift, and the Hoover pulls half that on a really good day.
I suggest you use a tracker bar pump for a better cleaning.  They are
cheap and the correct tool for the job.

Don Teach, Shreveport Music Co
1610 E. Bert Kouns, Shreveport,  LA  71105
dat-smc@juno.com