Does what it claims, installed very easily. Literally turn off cold supply at cold tap valve, remove flexi hose for cold tap valve, connect the included flexi hose to cold tap valve, push valve into 'IN' side of body, connect other hose to tap flexi pipe and push into 'OUT' side of body. Make sure the battery is in the buzzer, push buzzer and turn valve back on for cold feed. Run your water for 5 mins straight to condition the filter. Results in nice clear taste free water. Thanks 👍 😊