Carbon block is excellent
Kent Grizzell - Franklin TN (Monday, October 08, 2012)
The difference in the Dupont 800 series carbon filter and the Dupont 900 series (full carbon block) is very noticeable. The 900 is much better. We have a high level of chlorine in our water and the 900 is much better at removing and, I assume, other impurities while still having an excellent flow. We don't notice any restriction in the water pressure unless the city flushes the fire hydrants and clogs our filter. And the price is excellent. WalMart's price, when they have them, is about $10-11 each.