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I DONT USE EITHER ONE. GET A GARDEN SPRAYER THAT SCREWS ON THE END OF THE GARDEN HOSE, PUT DAWN DISH WASHING DETERGENT IN THE SPRAYER. SPRAY THE PENS UNTIL YOU HAVE A GOOD FOAM ON THE GROUND AND WALK AWAY. THIS WILL KILL ALL THE ADULT FLEAS. AND ITS CHEAP. WAIT 2 DAYS AND DO IT AGAIN TO KILL THE FLEAS THAT HATCHED.
Jason got my info off this forum awhile back. Had a few scratching and treated them and had no more problems. I treated 11 beagles this way no problems been about two months since I used it. Hope this helps