PuRoTwist refrigerator water filter system offer high output and high quality performance. purotwist has automatic shut off mechanism, we have listed very good quality filters for your fridge. Get clean drinking water for your family. Purotwist is mode in the USA that has 4 stage reverse osmosis system. Most of the refrigerator water filter will be shipped within 48 hours with shipment protection. This filter installation is very simple, follow installation manually carefully if required. You need to replace purotwist federator water filter in every six month. Safe and secure to order today