First of all, why do you want an ultraviolet light on your reverse osmosis system? Likely you will say that you want UV so that you can make sure your water is pure and free of bacteria. A reverse osmosis system filters down to below .001 microns, but the smallest bacteria is larger than .01 microns, so theoretically, a RO system should not allow any bacteria to pass through. However, if you look at almost any reverse osmosis system manufactured by any credible manufacturer, you will find that it says “Not for use on water that is not microbiologically pure.” This is because a RO system has mechanical seals and o-rings that could become compromised or fail, so you should not rely on reverse osmosis for bacterial purification.
Problem 1: Even if your water is contaminated with bacteria, you still bathe, shower and brush your teeth in it. A couple of years ago, I showered in contaminated water in Haiti and got infections in both eyes. It wasn’t fun, I can tell you for a fact. If you have children or grandchildren, you know that they drink from anywhere, even the bathtub. An ultraviolet light on the RO system does nothing for the rest of the water in the home. You would be better served with putting an ultraviolet light on the incoming water supply to treat the water before the reverse osmosis system, so that you are not installing the RO system on water that is microbiologically contaminated.
Problem 2: An ultraviolet light on a reverse osmosis system under your kitchen sink heats the water as it sits during the day or night. It’s almost hot enough to make your coffee in the morning! You could turn the UV light off, but then you could not be sure if your water was pure and turning the bulb on and off would shorten bulb by by up to 300% – not a good idea.
Problem 3: The heat generated by the UV light bulb can weaken the fittings, embrittle plastic tubing and create a leaks in many circumstances. That’s really pretty undesirable in most modern kitchens. Imagine comeing down in the moring and finding a swimming pool where your kitchen used to be.
Problem 4: To put a UV under your sink, you need electricity. I have heard people say “I have electricity to my garbage disposal” and they do, but your UV system will only work when you turn your garbage disposal on (not a good idea). You need to run an additional electric line to the ultraviolet system and that can often be a problem.
Problem 5: Most undersink ultraviolet systems are cheap plastic Asian Import models. They are very unreliable. I’ll be kind and just say that they inherently have a lot of problems, not the least of which are leaks.
So, if you want a UV for use after your reverse osmosis system, the odds are, once you weigh the pros and cons, you will decide against it. Many people opt to install a ultraviolet system on the incoming line to their home so that all of the water in your home is bacterially pure. However, in addition to Ultraviolet Disinfection, there are two additional technologies that are extremely effective at disinfecting water.
Pulsar Intercepter Filter: The Pulsar Disrupter Filter uses Electro-Adhesion to remove bacteria, virus and cysts “AHEAD” of the Reverse Osmosis Membrane. It also has PAC (powdered activated carbon) and Agion Silver on the media to remove VOC’s and prevent bacteria from growing on the media itself. This filter is used ahead of any other RO filters so as to keep bacteria out of the system, whether you know you have it or whether you just want to be safe and sure.
Pulsar Quantum Disinfection: A Pulsar Quantum Disinfection Filter uses a revolutionary, patented technology that uses quantum mechanic principles of electron movement to create surface catalytic sites to destroy microogranisms up to 99.999%. This should be the last filter in an RO system and is extremely effective at removing hetrotrophic and pathogenic bacteria which are commonly found in RO tanks. With Quantum Disinfection, a Ultarviolet light is totally unnecessary.
Note: This blog was initially published in 2014 and was just updated.