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Click HERE to read Frequently Asked Questions (FAQ) about Sparging Stones.


No Application Notes information

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Sparging Stones | Last DropInlet Filters | Inlet Filters

MicroSolv™ Sparging Stones can be used as an inlet filter from the solvent reservoir bottle to the HPLC pump. They can also, be used for dispersion of dry gasses (sparging) to keep your solvents degassed and under positive pressure in the reservoir bottle.

Designed and manufactured to be of the highest quality available, these stainless-steel filters are never touched by human hands. Touchless, they move directly from our sinter oven to be treated with 30% Nitric Acid and are then, finally rinsed with distilled water.

The most popular size of the inlet filters are the 10 µm units and for sparging helium or other gas the 2 µm units are most commonly chosen. Use gloves or forceps when handling these filters to avoid contamination of your solvents. Change units at least every six months.

  • Maximum Flow Rates: 2um = 5ml/minute, 10um = 25ml/minute.

  • Click HERE for Sparging Stone Specifications and drawings.

The MicroSolv™ Last Drop Inlet Filters for HPLC mobile phases are among the best values in the industry due to low cost and high quality. The unique design of the inlet allows your system to use almost every drop of mobile phase from the bottom of your bottle. Available with three types of connectors; for 1/16th and 1/8th tubing we suggest flange free connectors with ETFE ferrules. The "Tripod" connector allows you to slip the tubing over the adapter.


The Selection "FILTER" buttons refine the Products displayed in the Ordering Chart. They are described below and listed alphabetically by FILTER.

  • Internal Threading - SS Filter Stones that connect to soft tubing with an internal thread.

  • Last Drop Inlet Filters - Only Last Drop type of Inlet Filters are displayed.

  • No Stem - SS Filters, same as Internal Threading.

  • OD: 1/16th" or 1/8th"

  • Pore Size: 2.5um, 30um, 2um or 5um

  • Sparging Stones - SS Filters with various pore sizes in the frits.

  • Tripod Connector - Last Drop Filters that allows you to slip the tubing over the adapter.

  • With Stems - SS Filters with stems for slipping on tubing over and a friction fit makes a tight connection.

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