A quick "drive-by" search re. "Over the Top" grass killer reveals that
1) Active Ingredients = 1.7% of total volume. Based on chemical nomenclature protocols, the active ingredients are petroleum distillates/aromatics/alcohols/other derivatives.
2) therefore, its Inert Ingredients = 98.3% of total volume. After the debacle here in northern California last year, where the population *finally* succeeded in having an aerial spray campaign (over cities and residential areas) stopped in its tracks, I--with my fellow residents of the S.F. Bay Area, down to Monterey and points further south--am extremely leery of non-listed "inert" ingredients.
W/regard to the 2008 "Stop the Spray" campaign, several of the so-called "inert" ingredients were orders of magnitude (10x, 100x, 1000x, etc.) more toxic than the named active ingredient. "Trade secrets" was the excuse the supplier (and there was only one...) of the pesticide hid behind to not reveal those ingredients. But, eventually, the names of the "inert" chemicals were revealed.
A legal injunction followed shortly thereafter.
I think skepticism about such high percentages of "inert" ingredients (and, just in the past two days on this board, we've discussed products with 98.3% "inert" and 99.0% "inert" stuff) would be well advised.
Sunset Zone 17, USDA Zone 9