Features:

• Reduces greater than 99.95% Giardia and Cryptosporidium cysts
• Reduces asbestos, chlorine taste and odor, and sediment
• 0.5-micron (nominal) filtration
• Filter life up to 12 months or 1000 gallons
• Filter change reminder sticker

Editor Reviews:

Product Description:
Undersink Drinking Water Filter Replacement Cartridge, Filters Sediment, Bad Taste, Odor, Chlorine, Giardia, Crytosporidium & Asbestos, .5 Micron, Carbon Briquette, Filter Life 12 Months Or 1,000 Gallons, For Use With Model #US-550 True Value #529-274 Or Model #US-600 True Value #563-429.

Rating : - Restricted flow
Culligan Drinking Water Replacement Cartridge Carbon Block, 0.5 Micron, 1,000 Gallon Capacity #D-30

The D-30 cartridge severely restricts water flow and nowhere on the packaging does it indicate this. I had to return them to amazon for a refund. Am using the D-10's with no noticeable reduction in water flow/pressure. Suugest that Culligan come up with some indication of water flow for each of their water filters. If water flow is not an issue for you, then the D-30's are probably fine.