Filters come in sealed packaging

100 + Gallon Per Day High Flow / Cold Weather Dow Chemical Membrane. Best Membrane Sheet In The World 96-98% Rejection Rate For Reverse Osmosis Water Filtration Systems. Increase your RO systems clean water output in warm or cold weather. Cold water is more dense and harder to push through the system our membranes will increase your gallons per day.

Will Fit RO Systems with a standard 10" filter housing such As Hydro Logic Stealth 100 & 200, Performaflow HS200 & HS400 and Growonix 100, 150, 200, 300 & 400. 

Can be used for Hydroponics, Drinking Water and Aquariums.