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Replacement Stage 4 Post-Carbon Block Filter


Recommended Replacement: Annual

Make the most of your home water filtration system with a new CTO filter every year!



With a Pure Blue H2O Home Water Filtration System, you can enjoy clean, clear, great-tasting water for years to come. For best results, make sure you replace your Stage 4 post-carbon block filter about every year! This step in the home water filtration process is last but not least, helping ensure that not only is your water clear of contaminants, but also unpleasant tastes, odors, and appearance. Each filter provides up to 2,500 gallons of filtered water, and you can easily install it with a quarter turn and no mess thanks to our twist-lock manifold!

Order your replacement Stage 4 post-carbon block filter today, or make sure you’re always prepared with our annual five-pack reverse osmosis replacement filter subscription! Sign up today to get started.

Additional information

Weight2 lbs
Dimensions15 × 6 × 3.5 in