Four basic steps to preparing casings for stuffing.

SALTED:

Rinse salt from casings with fresh water.
Soften by soaking in fresh water at room temperature (approximately 21 Deg.C [70 Deg.F]) for 45 minutes to one hour. When hanks are placed in water, gently hand massage them to separate the strands and prevent dry spots which may adversely affect the stuffing process.
Take casings to stuffing table. Place in bath of fresh water. This water should be warmer to render a little of the natural fat in the casing. This will help to allow the casing to slide from the stuffing horn more readily.
Preflush the casings by introducing water into the casings and allow to run through the casing. This will also facilitate getting the casing onto the filling horn and moving the casing smoothly during the filling process.
PRE-FLUSHED IN SLUSH:

Requires somewhat less labor and time before stuffing, but all four steps should be followed.

PRE-FLUSHED WET PACK:

Goods are packed in a brine with lesser amounts of salt. Requires only steps 3 and 4. Pre-tubed goods (casings on plastic tubes to speed production) usually come this way. Tubed goods may require a charge of water after they are on the stuffing horn; this is done using a horn made specifically for that purpose.

PRE-FLUSHED IN SOLUTION:

Requires no soaking time. Only steps 3 and 4 need to be performed. Casings packed this way are more prone to damage in shipping and/or from temperature changes. These casings should be purchased in smaller amounts - usually a 2 to 3 month supply, although they can be kept longer. Barrels should be carefully inspected, with leakers used first, employing steps 3 and 4.