Ready-to-use RC dialysis sacks save time in preparation for desalting, concentration or purification. Sealed at one end, these sacks have a funnel attached to the top for easy filling. Packaged in 0.1% sodium azide, they should be rinsed with deionized water before use. Then fill and gently snap second closure on the tubing to seal the liquid in the sack. Order sacks in Spectra/Por 1, 2, 3, or 4.