Lab Strong cartridges are comparable to the Thermos Scientific Barnstead cartridges. Side-by-side testing shows fantastic results for purity and longevity. The Lab Strong water purification cartridge is used with the Thermos Scientific Barnstead B-Pure*, E-Pure*, NANO pure*, NANO pure II and NANO pure Quad water purification systems. 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.