Saved me from an expensive service call.
I mistakenly vacuumed up two corks with my central vacuum and tried all of the tricks shown in online videos to dislodge them.  This was the first time in 17 years of owning my central vacuum of ever having any sort of obstruction in the lines.  Worst of all, my system's suction line from my home to the main unit located behind my garage, run underground and under the driveway and garage. So I was not a happy camper with the loss of suction power and the prospect of an expensive service call.  So, as a last ditch attempt before calling in a professional, I tried a couple of these Free Flow sheets. Less than 10 minutes later, I heard a "clunk, clunk" at the main unit.  I powered it down and looked inside to find those two pesky corks, and full suction power had returned to the home inlets.  So, I wholeheartedly recommend this product.  If I could give it 10 stars, I would!!
Rating: 5 stars