So picked up a contract for some cell tower sites. Consisting of weed abatement and pre emergent. Was looking at Pramitol or Sahara for a sterilizing agent for the pre/post after major weeds have been removed from compounds. Have been doing some research on these but want some personal experience. Questions: How long average do they last? Specific precautions with leaching? Is there something else out there I haven't researched? Rates you have had best luck with? We deal with tons of blackberries!