iSpring FD15 10-Inch by 2.5-Inch Refillable DI De-Ionization Filter RO/Aquarium
Perfect for Reverse Osmosis DI Water System - Remove Hard Water material - To be replaced every 500-1000 gallons of water, produce 0ppm for your water - Fit 1/4" Fitting (not included) - Clear housing for easy view of media status - Refillable