Blog

Is Your Reverse Osmosis Water Flow Slow?

Posted by
Freeman Linton

reverse osmosis water flow slow

5 Reasons You May Have Slow Flow Rates From Your Reverse Osmosis System

Updated Oct 15, 2020

If the water coming out of your Reverse Osmosis (RO) faucet seems to be slower than normal, or slower than you think it should be, here are five reasons why you might have slow flow rates:

  1. Clogged RO Filters: If you forget to change your water filters, with time your system will produce less and less water. Clogged or fouled RO water filters is the most common reason for a slow-filling RO tank and faucet flow. Trying to fill a reverse osmosis water tank with a fouled membrane may take 4-6 hours, rather than the usual 2-4 hours. You may want to set a calendar alarm so you'll remember to replace your filters on time. To order filter replacements, learn how to find the correct filters for your system. And to simplify annual filter replacements, we've created filter bundles. Start of selecting your brand and model to determine available filter replacement kits.
  2. Reverse osmosis pressure tankPressure in Tank: You might have low air pressure inside the RO tank itself. Your tank should have pressure of 7 to 8 psi without any water in the tank. To check your pressure, locate the Schrader valve, typically covered by a blue plastic cap, on the side of the tank near the bottom. After removing all the water from the tank, use a low pressure gauge to determine the pressure in the tank. If low, add air with a pump until you have 7-8 psi. Be careful to only add a small amount of air at a time, as too much pressure can rupture the air bladder. For more water pressure tank troubleshooting, check out our Reverse Osmosis Troubleshooting Guide.
  3. Ruptured RO Tank Bladder: If you only get about 8 ounces (one cup) of water out of your RO faucet at normal water pressure, and then the water instanty trickles down to a very small stream, this typically is a sign the air bladder in the storage tank as ruptured. Bladder tank problems unfortunately cannot be repaired. The only way to resolve the issue is to replaceblue tubing reverse osmosis the storage tank. Replacement tanks can be found here
  4. Kink in water line: Make sure there are not any kinks in the water line, which would slow water production. And while you're inspecting your system, double check that the water supply line valve is in the fully open position.
  5. Temporary Loss of Water Pressure: You may have temporary loss of water pressure. An RO system needs a minimum of 40 psi to operate properly, but 60 psi is optimal. If all of your household faucets seem to have low water pressure, it may be that your local water utility company is temporarily flowing as lower pressure. Often, higher water pressure will return if you wait a bit. If higher water pressure does not resume, report the issue to your local water utility company.

Reverse Osmosis Filter Replacement Schedule

If none of the above seem to be the issue, consult our troubleshooting guide or call a water treatment specialist in your area. For products purchased through espwaterproducts.com, customer support is available Monday through Friday 8 am to 5 pm (Central) at 877-377-9876. Have your customer or invoice number ready.

Again, make filter changes easy for yourself with "filter bundles" that include everything you need for annual filter replacements. These bundles simplify filter changes and often save you money. Find your filter bundle by identifying your RO system brand/model.

How to Find & Order RO Replacement Filters: So it's time to replace the filters for your Reverse Osmosis water filtration system. Figuring out which filter or membrane you need to purchase can be overwhelming. Get started by determining the brand of model of your RO filter system.Tips to Determine Brand and Model of RO System The most [...]

Read More »


How Long Does it Take to Fill a Reverse Osmosis Storage Tank? The short answer is it typically takes 2 to 4 hours to fill a standard reverse osmosis tank (2.8 gallons or 10.6 L). Because the reverse osmosis filtering process takes time, storage tanks are a necessary component with any RO system. Without a storage tank, [...]

Read More »


Many of our customers who purchase an under-counter Reverse Osmosis water filtration system choose to install the system themselves. Yes, DIY is becoming increasingly popular, so when folks call in and ask about self installation, we generally answer, If you're handy and somewhat mechanical, installing an RO system should not be too difficult or time consuming. By [...]

Read More »


Is Your RO System Not Producing Water Fast Enough?  If your reverse osmosis unit seems to be producing less filtered water than it did previously, we outline here a few simple steps to check the current production rate of your system.  Follow these 5 Steps to determine how much water your  system is producing over a 24-hour period, [...]

Read More »


A high-quality reverse osmosis drinking water system will last for many years if it is properly maintained. In fact, we’ve been in business for almost 30 years and have seen many RO systems last 10 to 15 years. To make your system last longer, here’s what it takes:Regular Filter Changes First, pay attention to the filter change [...]

Read More »