The Lab Strong D400499LS Mega-Pure High Capacity Cartridge is comparable to the Thermo Scientific Barnstead D400499 Mega-Pure High Capacity Cartridge. Side-by-side testing shows fantastic results for purity and longevity. The replacement cartridge is suitable for operation in the Mega-Pure Single (D1) or Dual (D2) Cartridge Deionizer Systems and the MP-12A Glass Stills. The cartridge enhances the performance of Mega-Pure Glass Stills by reducing scale build up and increasing distillate purity. The cartridge is composed of two-bed ion exchange resin. The cartridge is designed to produce quality deionized water at an extended life to pretreat the Mega-Pure Still. The water purification cartridge provides outstanding quality you expect from your water system at a low cost. The cartridge is an economical alternative for all laboratories and is ideal for small volume applications. Lab Strong takes extra care in sealing our water purification cartridges to ensure exceptional quality is maintained throughout the two year shelf life. This cartridge is sealed in a military specification vapor barrier foil Mylar bag, which dramatically inhibits drying out of the resin.