Hi Doug
Keep reading,
Glynn there is a difference between controlled agitation and scrubbing, the best agitation is completed using the chickopee very soft brushes as on the envirodri machine, normally if the carpet is over wet during pre sparying this will have an adverse effect on the cleaning, as after the soil particle bond is shattered to much fliud will wash the soil deeper into the carpet, therefore you should always work toward the drier side of cleaning.
Hope this helps
Best regards Nick