Removes up to 99% of chlorine and 90% of sediment, rust, silt, etc. Filters chloramines and particulates down to 5 microns. Recommended when using the Merlin Garden Pro and making over 140 gallons of RO water per week on average. Essential for protecting the Merlin Garden Pro's RO membranes by producing ultra clean feed water. Includes: two-stage 20" pre-filter unit, metal bracket, 4' feed line to Merlin Garden Pro, filter wrench, and instructions. Measures 11" x 24" and carries a 1-year warranty.