Inlet stainless steel filters or sparging stones can be cleaned by ultra-sonication in 30% phosphoric acid, clean afterwards with DI water (ultra-sonication) and Methanol (ultra-sonication). Same would be true for all metal filters, like for column filters, inlet filters and more. But be aware, only the metal part! No PEEK rings, connectors or housings.
Step 1 cleaning with acid
Step 2 removing the acid from the filter
Step 3 conditioning the filter for both hydrophobic/hydrophilic solvents.
If you know which solvent you are going to use the sparging stone/filters with, you could condition the filter with these solvents, but be aware of their miscibility with water. Always use powder-free gloves when handling sparging stones.
For customers such as in the wine industry, use of 1M NaOH can be effective in the removal of compounds such as tartrates. Just be sure to thoroughly rinse and clean the sparging stone afterwards with a lot of water or even methanol.
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