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In
this method a detergent solution is "whipped up" into
a foam. The foam is then applied to the carpet with a
rotary agitator where it is
allowed to settle and dry and is then vacuumed up (usually later
by the consumer). The dirt
suspended in the foam is brought up with the foam during
vacuuming.
During
shampooing a solution is pre-sprayed onto the carpet and is then
"whipped up" by the machine as it is passed over.
Some
dry foam systems allow the partially wet foam to be vacuumed
immediately (before it dries) so the consumer does not need to
do it.
This
method does not involve rinsing and as such can actually leave a
dirt attracting residue in the carpet. This is a highly
undesirable side effect.
When
using a method that uses an agitator you must be careful.
A certain amount of agitation is required (as in the amount of
agitation a vacuum provides) but excessive agitation can
significantly reduce the life of the carpet by fraying the
fibers. This gives the carpet an unsightly
appearance.
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