I recently bought Bayer Dylox 6.2 which is 6.2% Trichlorfon. The homeowner version from the same manufacturer BioAdvanced 24 Hour Grub Killer contains 9.2% Trichlorfon. I'm getting ready to buy my fall fertilizer/pre emergent and was planning to buy Lesco 0-0-7 with Stonewall from SiteOne which is 0.43% Prodiamine. The homeowner version of the same product from Lowes is 0.68% Prodiamine. Seems odd for the homeowner version to have a higher concentration of AI.