Oceanic Under Sink Water Filter System - 2 stage filtration -Clear Housings This premium see-through Clear Housing offers many advantages. Without opening the housing, you can easily monitor the filter's condition. You will get an idea about your water's quality by looking at the color and speed of contaminant buildup on the filter cartridge. Although the 2 filters normally last 12 months on most city water sources, they may need to be replaced sooner if your water source has heavy sediments and other contaminants.So how do you know when to replace the filters? Just look at the stage-1 filter, when it turns from white to medium or dark brown, then you know it's time to replace the filters. DRINKING WATER FILTERS SYSTEM 2 STAGE 1st STAGE- SEDIMENT FILTER 5 MICRON Sediment filter to trap particles, including rust and calcium carbonate 2nd STAGE -CTO CARBON BLOCK FILTER Carbon filters are most effective at removing chlorine, sediment, and volatile organic compounds (VOCs) from water. COMES WITH FAUCET & FEED ADAPTER (PLASTIC) WRENCH, TUBING & ALL FILTERS INCLUDED. EASY INSTALL.