Anyone use delvo esc pucks for emergency situations?

i use to a few years ago, they work well if you go ahead and use them before the mud gets hot, you know the suppliers in your area you know who will take forever to get the call back, my advise is when the last truck is unloaded go ahead throw a  couple in circulate it and go sit in the shade for a few and enjoy your lunch, fritz's deleay set packs work well to if you use them in the same manner.

  I really dont plan on adding ESC to the ready mix truck,I will use it sparingly,a little here ,a little there.I put about 1/8th of a puck in my hopper along with my liquid slick willy,pill bottle size,and it seemed to "fluff" the initial push of concrete through the boom.The ESC is designed to stop segragation in a plastic concrete mix.