RO water filters can be pricey. The amount of water you need to filter per day will affect the price of the filter you buy. (A larger household and/ or lots of water usage = a larger filtration system.) If you know you won’t need a high number of gallons per day (GPD), you can reduce your overall costs — initially, and over time — with an RO system that has a lower GPD filter.
Water Pressure Conditions Prior to Installation
RO filtration systems rely on water pressure to function, so make sure your home can handle it before purchasing your filter. Optimum RO flow requires at least between 40 to 60 psi, and ideally no lower than 50 psi. Low water pressure will reduce the flow of water coming from your faucet, resulting in more waste and decreasing the efficacy of filtration.
Capacity and Speed of Water Production
How much water you use will determine the capacity of the semipermeable membrane or gallons per day (GPD) of the unit you need. The higher the GPD number, the higher the production membrane. If you’re going to use less water per day, a lower production membrane is a better choice because it will run longer and spend less time sitting idle.