LSRV is generated by any of the F LO -V IS T family of additives, premium-grade, clarified xanthan gums. Conventional rheological properties, yield point and RPM can be adjusted at relatively low polymer concentrations, but LSRV does not develop until a critical polymer concentration has been exceeded. LSRV, being the last rheological property to develop, is also the first to be degraded. A premium-grade xanthan such as F LO -V IS T minimizes the concentration of polymer required to create LSRV and also to maintain it. In areas where non-clarified xanthan has been used to replace the premium-grade, clarified xanthan due to inventory shortages, it takes twice as much to maintain the desired LSRV.