Please explain

[vacowacko]

Can someone please help me wrap my head around this. So as we all know Kirby and other vacuum demos use the "last one wins" method to "fake test" that their vacuum is the best. Even if it is. However my question is if a Kirby or others are supposedly capable of picking up dirt even under the pad as some say. Then why does it still leave things behind? How long of vacuuming would you have to do to get "everything" up? and why is it an impossible if so ?

 

[ultralux88]

No vacuum cleaner is cleaning dirt from under the pad, that's just not the truth. Most never carpet tends to have a layer in the backing that doesn't let moisture through very easily, and not much dirt will be going through that either. If you have a carpet where the backing is more open, you'll get dirt on top of the pad, and a good vacuum can help remove that, though ideally if you're actually vacuuming regularly with something that actually cleans, the idea is the dirt won't be building up and sinking in so deeply. The dirt they are actually getting up is all in and on top of the backing. And those Kirby demo pads are designed to make even a small amount of dirt look like a vast amount.

 

[cheesewonton]

Can someone please help me wrap my head around this. So as we all know Kirby and other vacuum demos use the "last one wins" method to "fake test" that their vacuum is the best. Even if it is. However my question is if a Kirby or others are supposedly capable of picking up dirt even under the pad as some say. Then why does it still leave things behind? How long of vacuuming would you have to do to get "everything" up? and why is it an impossible if so ?

Kirbys seem particularly reliant on sealing to the rug being vacuumed. If anything breaks that seal like something that overlaps a rug or any part of the nozzle overhangs the edge of a big area rug they just seem to stop cleaning. Kirbys excel on nice unobstructed wall to wall carpet. Not so good when you have close furnishing and an odd assortment of area rugs and hallway runners.

 

[centralsweeper63]

I took lots of A3 sized carpet samples of Loop wool, uneven loop wool, low pile nylon and medium pile nylon so there is varying levels, the Kirby tends to do fine so long as it is on it's lowest setting.

 

[centralsweeper63]

As for the explanation, no vacuum is 100% effective on every pass. Maybe 70-75% pickup on the most amazing machines there has ever been. Then, on the next pass, you pick up 75% of 25% of the original dirt. Basically you are left with 1/4 of the dirt that was there last time. If your vacuum picks up 75% of dirt it would be 25% left over, 6.25%, 1.5625%, 0.390625, 0.09765625. As you can see it is impossible to get to nothing, only very close to nothing. Now, does your vacuum pick up 75% of dirt. Extremely unlikely, probably more like 50-60%