The ROM IV: Our Best Reverse Osmosis Water Filter For Homes

When it comes to the removal of contaminants from drinking water, reverse osmosis water filtration is one of the most effective methods possible. Over the years we have offered a wide range of reverse osmosis water filters and we are excited to carry the Everpure ROM IV filter system. This system is the best reverse osmosis water filter we have ever offered in terms of drinking water quality and ease of use for homeowners. Reverse osmosis is a distinct type of filtration that cleans water through a process that is very different from most of our other water filter systems.

In order to fully understand how RO water works, you need to understand the process of osmosis. Osmosis occurs when a solvent, typically water, is on either side of a semi-permeable membrane. When the water of both sides have different levels of dissolved solids, the water moves through the membrane to achieve an even concentration of dissolved solids on both sides of the membrane.

Reverse osmosis takes this process and completes it in reverse. Instead of water naturally moving through the membrane to achieve an even balance of dissolved solutes on both sides, pressure is applied to one side to force the water to maximize the imbalance of dissolved solids on both sides of the membrane. The water arrives on one side of the membrane with dissolved contaminants and pressure is applied until the opposite side of the membrane has clean purified water and the entry side is left with a small quantity of water with a high concentration of dissolved solids.

After the filtration process is completed, the small amount of water remaining on the entry side is removed as waste and the process starts over. This process of filtration takes a little longer than carbon block filters, where water is constantly moving through the cartridge. In order to make sure that homeowners always have freshly filtered water ready to drink, the ROM IV comes with a storage tank to ensure that plenty of water is always ready to consume while more water is being filtered through the membrane.

The RO membrane itself is somewhat sensitive. Chemicals like chlorine can eat away at the membrane and large pieces of particulate matter can clog them. That is why the ROM IV system has a pre-filter cartridge to help remove these substances and ensure a long and healthy RO filter lifespan. The membrane cartridge itself provides incredible filtration, effectively removing tiny waterborne contaminants from the water including heavy metals like lead. This filter can reduce the levels of contaminants in drinking water by over 90 percent, offering the best possible drinking water for your household.

Despite the effectiveness of the filter membrane, some contaminants can still make it through. That is why the ROM IV also includes a post-filter that is designed to remove any volatile organic compounds that might slip through the RO filter membrane. This extra layer of filtration is just one more factor that makes the ROM IV the best reverse osmosis water filter option for homeowners.

Another huge advantage with these filters is their ease of use. Like all home Everpure systems, the ROM IV installs easily under your kitchen sink, mounting to the inner wall of the cabinet. The water storage tank also fits under your sink so you can always have several gallons of water that is ready to use. The ROM IV can filter up to 14 gallons of water per day which is more than enough for most households. Filtered water is dispensed using a small air gap faucet. This means that homeowners can continue to use their kitchen faucet as usual while being able to enjoy the convenience of having filtered water on tap.

Once the system has been installed, maintenance is a simple process. The cartridges are designed to be changed annually and swapping all of the cartridges at the same time is recommended. If you notice that water flow has been significantly reduced or the taste, color, or odor of your water has changed then you might want to consider changing the cartridges early.

If you are interested in the convenience of having incredibly clean water available 24/7 in your home, then the ROM IV is the best reverse osmosis water filter for you. Our entire team is dedicated to helping our customers find the filtration solutions they need. If you have any questions about the ROM IV or any of our other water filters, feel free to reach out to a member of our team by email at We look forward to hearing from you and helping you find the best solution for your home.