Barnstead Cartridge Easypure Pretrtmt. Barnstead Cartridge Easypure Pretrtmt D50230 / 26302-469 is part of a wide selection of Barnstead Ultra violet water purification units. Combining excellent quality with an affordable price the Barnstead Cartridge Easypure Pretrtmt D50230 / 26302-469 can meet your scientific research needs while still offering a good value for a budget conscious end user. If you have any questions about any of our Ultra violet water purification units please do not hesitate to contact our customer service for further guidance. Compact systems for laboratories requiring