Spectra/Por ® 1 - 5 Dry Standard RC Dialysis Tubing is packaged dry for handling and storage convenience. The tubing is available in 15 m/roll and 30 m/roll to provide better economy for applications requiring larger amounts of tubing. Most of the dry tubing rolls contain glycerin as a humectant which is easily removed by soaking 30 min in water. Some tubing rolls do not contain glycerin and do not require soaking prior to use.