It will typically take somewhere between 2-4 hours to fill a standard RO 2.8 gallon storage tank. This takes time because the RO filtration process takes time to complete. An RO storage tank is a vital component in every RO filter system. If you didn’t have the storage tank, you could wait up to 10 minutes just to fill a regular glass with clean drinking water. Thanks to the storage tank you can quickly fill any drinking vessel or cooking pot in no time at all. Let’s take a closer look at the RO storage tank and how it works.

The RO Storage Tank Fill Rate

The fill rate in your RO storage tank will vary a great deal depending upon three main factors.

  1. The RO System Type

The specific RO filtration system that you’ve installed will have an impact on how quickly your storage tank fills with RO filtered water. Some systems may be designed to produce as much as 100 gallons of water each day and others could be half that volume. As a rule of thumb, a larger RO storage tank would fill faster, in the above example the 100 gallon tank would fill twice as fast as the 50 gallon tank.

  1. The Water Pressure

The incoming water pressure will affect how quickly the storage tank can fill. An RO system will work efficiently with an incoming water pressure of around 60 psi. The RO system will still operate within the 40-80 psi range, but the performance could be compromised. If the household water pressure is around or below 40 psi the water cannot be pushed through the semipermeable membrane filter. This will mean that the water pressure isn’t high enough to produce the filtered water that you need. In this case, it will be necessary to add a pump to boost the water pressure, ideally to 60 psi where it will be more effective. This will also ensure that the RO storage tank fills faster up to the maximum gallons for the day.

  1. Older or Clogged Filters

The semipermeable membrane filters in your RO system work hard to clean the water that is forced through them. Over time, the filter could become clogged with contaminants, or perhaps they begin to be less effective as they get older. When the filter is blocked or less efficient, it will slow down the flow rate significantly. This will have a direct effect on how fast the RO storage tank will fill. If you find that your storage tank always seems to be half empty, check your filters and change them. Water treatment experts recommend that filters should be trained every 6-36 months. This may seem like a significant disparity, but the actual time period can vary a great deal depending on the filter in your system. Changing the filter is easy to do, the instructions and recommended changing times should be in your owner’s manual.

If you’re interested in an RO filtration system for your home, contact a local water treatment professional for more information.