I found this review on Amazon that may be pertinent:
"CAUTION: Cartridge Prone to Premature The filter cartridge that goes in this unit is a defective product prone to preRupturing, January 23, 2009 By yojimbo (wash, dc) - See all my reviews
You're lucky if this lasts 50 gallons b/c the Dupont FMC300 is prone to premature rupturing, likely due to a manufacturing/design defect. The bottom seam/weld of the cartridge is very weak and will not last anywhere near the 200 gallons of life it's rated for. I have gone through three FMC300 cartridges (rated for 200 gallons) but in fact each lasted less than 50 gallons of use. The first sign of trouble is usually a slow drip from somewhere around filter unit; eventually it deteriorates into a gushing fountain. Dupont Customer Service is aware of the problem with this cartridge, as well as the FMC103 rated for 100 gallons. The construction is the same, and they both have the same defective bottom panel seam/weld. If you call to ask for a replacement of a leaky faucet filter unit they will demand a dated sales receipt, etc. But if you tell them you have a defective, 'ruptured cartridge' then they will offer you a replacement, no questions asked. Obviously, they know the FMC300 cartridge is a defective product."
About the DuPont
"CAUTION: Cartridge Prone to Premature The filter cartridge that goes in this unit is a defective product prone to preRupturing, January 23, 2009
By yojimbo (wash, dc) - See all my reviews
You're lucky if this lasts 50 gallons b/c the Dupont FMC300 is prone to premature rupturing, likely due to a manufacturing/design defect. The bottom seam/weld of the cartridge is very weak and will not last anywhere near the 200 gallons of life it's rated for. I have gone through three FMC300 cartridges (rated for 200 gallons) but in fact each lasted less than 50 gallons of use. The first sign of trouble is usually a slow drip from somewhere around filter unit; eventually it deteriorates into a gushing fountain.
Dupont Customer Service is aware of the problem with this cartridge, as well as the FMC103 rated for 100 gallons. The construction is the same, and they both have the same defective bottom panel seam/weld. If you call to ask for a replacement of a leaky faucet filter unit they will demand a dated sales receipt, etc. But if you tell them you have a defective, 'ruptured cartridge' then they will offer you a replacement, no questions asked. Obviously, they know the FMC300 cartridge is a defective product."