The drying tube is filled with a desiccant to remove moisture from the air flow. The Drierite crystals used in the cylinders are originally blue in color. When the crystals turn pink, they must be replaced.
Crystals may be replaced in three different ways:

1. Install a new cylinder of Drierite crystals available from DSI
2. Remove and replace the crystals with new Drierite crystals
3. Reuse the existing crystals

Replacing the Crystals

The easiest way to replace the desiccant is to empty the used crystals and refill the cylinder with new crystals. Replacement crystals are available from DSI or from Drierite.

• After removing the drying tube from the cradle, unscrew the cap and remove the spring, perforated plate, and filter.

Tip: You may experience some difficulty when unscrewing the top of the tube for the first time. Continue to apply pressure or use a lid removal device until the cap turns.

• If you are not planning to dry and reuse the crystals, have a safe place ready to dispose of them (empty jar or a garbage bag, etc.).

• Empty the crystals and replace the filter.
• Fill the container with new Drierite crystals up to the line made by the previous crystals. Make sure you do not fill the container past the connection point.

• Replace the filter, perforated plate, and spring. Screw the cap back in place and return the tube to the drying stand.

Reusing the Crystals

To reuse the crystals, set an oven to 415 degrees Fahrenheit.

Pour the crystals into a flat pan (do not reuse the pan for human cooking)

Heat the crystals until they turn blue again. When they are completely cooled down, pour them back into the drying tubes.