While the availability of HPLC-grade solvents diminishes the need for pre-filtering, it is still imperative that a filtration device be installed in the reservoir. Placing a filter in the reservoir is an economical way to filter particles that may result from buffer salt precipitation, airborne dust, improperly cleaned glassware, or microbial contamination; none of which are remedied by the use of HPLC-grade solvents. The OPTI-SOLV® Reservoir Filter employs a unique conical flow path designed to prevent air bubbles from being trapped and interfering with analysis. The new OPTI-SOLV® filter placement slightly protrudes from the housing which allows for efficient, solvent usage without the danger of introducing air.