Thickeners, stabilisers and polymers require high colloidal breakdown and maximum dispersion at the moment of wetting.
Immediately after hydration, they are extremely sensitive to shear. Conventional agitation over the liquid surface easily causes agglomerate and lump formation. The same problem also occurs during induction via the container vacuum or injectors.
During dispersion of these agglomerates, part of the thickening action or of the polymers is destroyed irreversibly.