Here is some silica gel dessicant that you can use in your pcp compressor filter to dry the air going into your pcps and air tanks. enough for several fills of the large style oil/water filter, when capped on each end with a cotton filter tampon.
The blue silica gel desiccant will turns to red color when it absorbed moisture from the air.
The Orange silica beads will turn pale when wet.
You can reuse your used silica gel with Microwave. Heat in microwave just 5 minutes (Medium / low power), Color will slowly change back to blue/orange after reactivation.
Box size:25*55*55mm; 105grams
2 Boxes Blue Silica Gel Desiccant
Or bag of 100grams of orange beads