I got the FleetGuard strips and mine came in little packages that you tear open. I took my sample from the pet**** and let it sit for a few minutes cause it was still alittle warm. Mine tested low on the additive so I added a pint and will test again this weekend. I drained the coolant into a clear glass cup and after I let it sit for alittle bit there was a bunch of crap siitng at the bottom. I immediately ordered the coolant filter from dieselsite and will be installing it this weekend.