Full Compatibility: Standard size universal cartridge of 2.7 x 2.4 inches, our shower filter is easy to install in any home. The shower filter uses a standard 1/2 inch thread and is compatible with wall-mounted, handheld, rain shower heads, and combo shower heads for versatile home use. Health Care Shower System: Our shower filter has 20 stages of filtration, which can effectively reduce chlorine, heavy metals, fluoride, limescale, and limescale in the water. Chlorinated and chemical hard water causes itchy skin, dandruff, eczema, dry hair, and brittle nails. Our amazing shower filters immediately begin to rejuvenate skin, hair, and nails. Soft and Smooth Your Skin: With this filter, your skin feels soft and moisturized. Your skin is no longer dry, irritated, and itchy: Helps relieve skin problems, sensitivity, and allergies, and prevents eczema from flare-ups. Our skin is our largest organ and absorbs everything we wear. Using this water filter to protect yourself from toxins in the water is invaluable. Soft and smooth your hair: No harsh chemicals that could damage hair. With this filter, hair is back to normal. Keeps blonde color bright and prevents brassy tones. Prevents significant hair loss and hair color from turning brassy. A lifesaver for my hair and skin in particular. Easy to install: No tools, just hand tighten. Change the cartridge every 4-6 months once the water pressure becomes low. 4 replacement cartridges will provide up to 16 months to 2 years of filtration for your hard shower water.