Crystal Quest Mega Undersink Replaceable Double Fluoride Water Filter System Eagle Redox Alloy is a major advancement in water treatment technology that works on the electro-chemical and spontaneous-oxidation-reduction (REDOX) principles. Chlorine is instantaneously and almost inexhaustibly oxidized. Easy to use and install on most sinks. Please note: When considering installation, if current under sink plumbing is hard copper tubing the saddle valve would be used; for flex tubing the T-valve would be required. Saddle valve is sent with order unless T-valve is specified. Dimensions: 10 Operating Pressure: Min 20psi - Max 60psi(pounds per sq. in.) Operating Temperature: Min 40 degrees f Max 90 degrees f Max flow rate: .5 gallons per minute