The LabStrong cartridge kit is comparable to the Thermo Scientific Barnstead cartridge kit. Side-by-side testing shows fantastic results for purity and longevity. The cartridge kit is used with the Thermo Scientific Barnstead E-Pure* ultrapure water purification systems. The water purification cartridge kit provides outstanding quality you expect from your water system at a low cost. The cartridge kit is an economical alternative for all laboratories.