pentek pentair pentek wpx100bb20p big blue sediment water filter, 20-inch, whole house polypropylene string-wound replacement cartridge, 20" x 4.5", 100 micron is up for auction in Tools & Home Improvement. The current bid is $1.00, 98% below the $55.23 MSRP, in New/Like New condition. Bid on this item at our Rogers - N Dixieland Rd. location before the auction closes.