Labconco WaterPro PS/HPLC Polishing Stations Labconco Polishing Kit Required. Combining top-notch and uncompromising quality with an affordable price the Labconco WaterPro PS/HPLC Polishing Stations Labconco Polishing Kit (Required) 9047201/ 30181-398 can fulfill your laboratory needs while still offering a great value for the money. Product Category Description: WaterPro PS/HPLC Polishing Stations Labconco Designed for analytical and research labs requiring Type I (up to 18.2 megohm-cm) water having total organic carbon (TOC) levels