VEVOR Air Compressor Filter Regulator, 3/4" NPT 4-Stage 5μm & 0.3μm & 0.1μm & 0.1μm Air Drying System with Micron Filters & Double Desiccant Dryer, Auto Drain Air Compressor Water Separator 175PSI Max
The blue beads are silica gel desiccant. Pour one packet into each of the two empty cups on the right, and wait until the blue turns pink. Replace them every 3-5 months.