Quikrete countertop mix is about $23.00 per bag and Quikrete 5000 is $6.50/bag. That is quite a big difference. Quikrete countertop mix has much smaller aggregate that is the size of sand. Quikrete 5000 has aggregate the size of pea gravel. The countertop mix has a plasticizer additive which makes it so you need less water to get a flowable mix.