Complete your Water Doctor ROS4A system with this full set of essential replacement filters. Specially designed for the Water Doctor ROS4A 4-Stage Reverse Osmosis System, this 4-pack includes all the critical filtration stages to ensure your water stays fresh, clean, and safe.
What’s Included:
PP Sediment Filter (Stage 1) Captures rust, dirt, sand, and other large particles ➤ Recommended Replacement: Every 6 months
CTO Carbon Block Filter (Stage 2) Removes chlorine, odor, and improves taste ➤ Recommended Replacement: Every 6–12 months
T33 Post-Carbon Filter (Stage 3) Enhances water taste by removing residual impurities ➤ Recommended Replacement: Every 12 months
RO Membrane Filter (Stage 4) Made from premium thin film composite (TFC), filters down to 0.0001 μm Removes bacteria, viruses, heavy metals, antibiotics, dissolved salts, and more ➤ Recommended Replacement: Every 2–3 years
Quick Twist Installation – No Tools Needed Each filter is designed with Quick Twist tech for easy, tool-free replacement in just seconds.
NSF-Certified Materials Built to meet international safety and quality standards, ensuring long-term performance and peace of mind.
