The result of this process produces a certain amount of “wastewater”, which contains a high concentration of those rejected contaminants. In standard under-the-sink reverse osmosis systems, for every 1 gallon of pure water produced, around 4 gallons of waste water goes straight down the drain. AquaTru does things differently. AquaTru is 4x more efficient, creating very little wastewater that can even be used for watering your lawn. Just one set of filters replaces 4500 plastic water bottles (16.9 oz)! By avoiding bottled water and creating your own purified water, you not only reduce single-use plastic waste in our environment, but AquaTru' s long-lasting filters also add up significant savings over the life of the product. 4-Stage Ultra Revers Osmosis Purification Process: Mechanical Pre-Filter: Removes sediments and cloudiness (turbidity) from water. Activated Carbon Pre-Filter: Removes more than 99% of chlorine and chloramines. High-Efficient Reverse Osmosis Filter: Removes toxic inorganic contaminants including Lead and Chromium 6. Activated Coconut Shell Carbon VOC Filter: Removes toxic organic chemicals, which ensures great-tasting water. Filter Life: Change your Pre/Carbon Filter (filter 1-2), the earlier of 600 gallons or 6 months; VOC filter (filter 4), the earlier of 600 gallons or 12 months; Reverse Osmosis filter (filter 3), the earlier of 1200 gallons or 24 months (2 years).