The Pre-Vac Myth
Posted By d-day on 12/14/2010 at 9:25 PM
I have used Sanitaires for over ten years, and it is a good vacuum cleaner indeed. However, I no longer pre-vacuum unless the customer requests it and pays additional for it.
Why?
Well, do this little experiment for yourself: Run your Sanitaire (or whatever vacuum of your choice) over a room of carpet. Then pre-spray lightly. Then run a Counter Rotating Brush (
CRB) machine over the pre-sprayed carpet.
You will be surprised to discover that
1) your pre-Vacuuming has not removed nearly as much hair, dust, lint, etc. as you think it does, as it leaves most of this debris in the carpet (and I mean most as in 80%+) and
2) Dry soil removal is not most effectively accomplished when dry. Dry soil removal is best accomplished by lightly pre-spraying and then removing it via
CRB.
The assertion that dry soil removal is best effected by pre-vacuuming is simply an
IICRC/Vendor created myths designed to sell you vacuum cleaners.
If you are using a TM, then like it or not, the dirt and debris that you see in your vacuum bag/dust cup will be removed by your TM, and there is no need to pre-vac.
If you do not believe this to be so, then run the tests yourself using an external in-line filter in your TM vacuum hose - Seeing is believing, after all.
I recommend that you do the test yourself, rather than rely upon "tests" conducted by the CRI,
IICRC, or any other profit- and power-motivated, self appointed, self-anointed industry board.
If you really want to maximize dry soil removal, dust, hair, lint, etc, then pre-spray and run a
CRB prior to extraction.
That having been said, if I were to show up to clean carpet and said carpet were covered with kitty litter and bird seed, I would use a dry vacuum to remove said kitty litter and bird seed prior to pre-spraying and running my
CRB.
Now, before any newly minted kool-ade drinking,
IICRC certified newbie wing-nut comes out swinging and slinging the
IICRC generated mantra about dry-soil removal, I say "Do the tests yourself." I was
IICRC certified (techs and firm) for the better part of a decade. I've been a wand slinger since one week out of high school in 1986. I don't need some twenty-three year old unemployed would-be accountant turned carpet cleaner lecture me on the "dry soil/pre-vac" blah blah blah.
It is a myth. A lie. A deceit.
Carry on.