I tried the Celcius - Revolver combo a couple of years ago when I had some Revolver left over. I mixed 2oz of Relover with the high rate of Celcius in a 1gal sprayer and spot sprayed the Dallisgrass in the Fall. It did keep the Dallisgrass down the next year for quite awhile but did not kill it. I would not buy Relolver just to use for this application. If you already have it and wanted to use it this Fall on Dallisgrass in St Augustine it did not seem to hurt the grass but for no longer than it suppressed the Dallisgrass I would not spend the money for it. I keep hearing that Tech High [Texas Tech] tested or is still testing a herbicide that is killing Dallisgrass and is safe for St Augustine but they will not say with what manufacturer and when/if it might reach the market.