Step 6 - Make your own Dumbbells - Fill the molds

 Fill each bucket to the same height with concrete, and just enough water to make a thick paste.  You can check the weights as you fill them. Rremember each mold will be one-half the weight of the finished dumbbell!

The pvc pipe portion has negligible weight, less than 1 lb for sure, so I wouldn't worry about that.

 

Next: Step 7 - Weigh each end