Suggested Retail: $29.99. Core 300 Replacement Filter for Levoit Air Purifier Core 300-rf Core 300 - Pack of 2 White - This is a pack of 2 replacement filters compatible with the Core 300 Air Purifier. Made from HEPA H13 and Activated Carbon, these filters ensure optimal performance of your air purifier. Customer reviews rate this product highly with 4.7 out of 5 stars. Brand: Improvedhand Model: Core 300 Filter -- LOT STICKER: TCE-BOX-BOXTCEB0797-ITEM-e022def6___LPNRRIC6932380 -- SIZES ARE ESTIMATED. 7 CALENDAR DAY FULL REFUND GUARANTEE (FROM PRIMARY PICKUP DATE) ON THIS ITEM IF ANY ISSUE IS FOUND THAT WAS NOT DESCRIBED/PICTURED. 7 CALENDAR DAY STORAGE (FROM PRIMARY PICKUP DATE) IS ALSO AVAILABLE. THE PRIMARY PICKUP DATE IS THE DAY AFTER THE AUCTION ENDS. SEE NOTES TO BIDDER, IN AUCTION DETAILS, AT THE TOP OF PAGE 1 FOR MORE INFO.