iSpring UVF55FS Whole House UV Water Filter with Smart Flow Sensor Switch, 55W, 12 GPM

We installed this whole house filter along with a couple of up-stream filters on our well-fed cabin. There is a variable amount of sediment which necessitated the particle filters and the whole system is performing as expected. The bacterial contamination which this was installed to treat was not detectable after installation. It's been working consistently since installation and while we did have an issue after 6 months with the ballast, the service from the company was fantastic, they sent out a repair part immediately and the issue was resolved. I recently also examined the light and quartz tube, and it was clear and operating fine. I do have a spare quartz tube and backup lights for the replacement which is expected to be needed annually.

I installed the iSpring UVF55FS UV Water Filter on our well supply, and the difference has been night and day: Powerful UV Sterilization: The 55 W lamp neutralizes bacteria, viruses, and other pathogens instantly—no more worry about microbes in every glass. Smart Flow Sensor Switch: The UV only powers on when water runs, extending lamp life and saving energy. High Flow Capacity: At up to 12 GPM, it easily handles simultaneous showers, faucets, and appliances without pressure loss. Whole-House Protection: Every tap—from kitchen to outdoor hose—now delivers clean, odor-free water. Easy Installation & Maintenance: Straightforward plumbing hookups and simple annual lamp replacement make upkeep a breeze. Since installation, that “well water” smell is completely gone, and my wife happily drinks straight from the tap for the first time—no more pre-filtering or bottled water. Room for Improvement: None—this system has worked flawlessly from day one. Highly recommend for anyone on a private well!

Here is my install, it took me about 4-6 hours to install. I leaked tested the unit overnight and I had no problems with the unit. Theres a couple of things to keep in mind when installing, 1. I would encourage you to have a GFCI or something similar when plugging the unit in, water and electricity is really close in relationship with this unit. 2. When installing the Quartz tube be sure not to install the Oring too high on the tube because doing so will bottom out the tube on the stainless cap while snugging up the cap, could lead to a broken tube. 3. I installed a filter after the unit just in case there is any glass breakage, the filter will catch the glass shards instead of going up into the house with the water supply. 4. I would order and have on hand extra supplies such as Orings and Quartz Tubes as well as an extra UV light bulb. I plan on using new Orings while cleaning the Quartz Tube as needed to minimize the chance of leaks. Like I said I have just installed the unit and will report back in a few months after use, I plan on having no issues because the unit as a whole seems to be of excellent quality. The Quartz Tube and UV light parts were packed with a very good foam outer layer and cardboard sleeves for the parts. Instructions are pretty straight forward. So far Customer service has been excellent via email because I just can't find time to call and speak with CS. George Update....here it is 5/16/2025 and the unit is working flawlessly. I'm so glad that I purchased this unit when I did it made an excellent addition to my filtration system. George

Great Product. I have this installed at my vacation property where our water supply is a spring that was tested and not potable. I Installed the iSpring UVF55F5 Whole House UV water Filter with Smart Flow Sensor Switch and a sediment filter, had the water tested again and it was good to go. Additionally, I have reached out to customer support a couple of times and they have been amazing. Anyone with any experience at all knows that customer support doesn't seem to be important to most companies these days. I can assure you, this has not been the case with iSpring. I would highly recommend the company and this product.

This UV Filter is working very well, now, but I had some challenges to get it installed with leaks. Customer Service (Michele) was fantastic in resolving my leaking problem. After installation, this UV Filter as the last component of a simple water system is working great! Even though I added this UV light after two whole house filters, I did not notice any pressure loss. My water is noticeably clearer and no more bad smells or tastes. So overall, great product and top notch Customer Support (from Michele) My first comment is the directions are very vague and the installation video is pretty good but needs to be more detailed. My leak occurred at the outlet when I installed the flow detector that has a rubber washer gasket . I believe my washer had a defect and seems to have a flat side. When I turned the water on this leak sprayed water everywhere. My ballast and light bulb were soaked and even with tightening , and resetting the gasket, I was unable to stop the leak. I called customer support and Michelle immediately addressed this problem. After receiving my Amazon receipt, she sent out a complete new flow sensor, light bulb, ballast, and new gasket. It arrived 3 days later via Fed Ex. I put the replacement parts in and presto, no leaks and my UV filter works perfectly! Do not over tighten the flow sensor. I found it was tight enough when the arrow aligned with the outlet. The new ballast is different from the directions. It senses flow and then lights up for 300 seconds and you will see the countdown on the LED display. I can see the light shining in my Pex Pipe which is recommended by most companies to be 6-12 inches away from the light( mine is 10” away) I sincerely was ready to return this filter with the leaks and several concerns with equipment short comings like O Rings on the quartz sleeve that are the only thing preventing leaks and the annoying power cords that are just barely long enough to install your bulb. Had Customer Service (Michele) not immediately made things right, I would move on but now I’m impressed with this system and would recommend this product. Hang in there and don’t hesitate to call Customer Support.

I bought the UVF55FS for my rainwater system and it's working great! At first, I thought I'd wasted my money because, after completely flushing my entire system, a coliform bacteria test came out positive. It did it again after a second complete flush. I finally realized that bacteria are pretty sticky and some will inevitably remain stuck to the sides of the pipes, even after multiple attempts to wash them out. So I decided to fill the whole system with a strong concentration of chlorine bleach and I let it stand for 3 hours. Then I flushed the entire system out again until all traces of chlorine odor were gone. I continued using the system for washing but not drinking for a few days then retested for bacteria. This time, the test showed ZERO bacteria. I even let the test incubate for a couple extra days to be sure. One thing I'd recommend is NOT waste your money on the version that I did with the flow sensor. I think the flow sensor is a bad idea now that I've had some experience and more time to think about it. For one thing, the flow sensor will not turn the UV lamp on until flow rate rises to 0.66 GPM. So if you use this mode and you run some water at anything less that this rate, the bacteria-contaminated water entering the UV unit can pass right through without being sterilized. Another problem is that even when the lamp turns on, it will take it a while to come up to full intensity, allowing more unsterilized water to pass through. Yet another problem is that the lamp may not last as long if it's continuously cycled on and off. Therefore, I'm leaving mine on 100% of the time and expect to replace it in 1 year. A few corrections for the manual: On page 4, it incorrectly states the maximum water pressure allowed is 43 PSI. Page 3 apparently has the correct spec which is 85 PSI. It's also stated on page 12: 4 PSI min / 85 PSI max. On page 4, it says to make sure the inlet is at the bottom if you mount the unit vertically because they incorrectly say it will slow down water flow. It won't slow the flow regardless of putting the inlet at the top or bottom. The only way their statement could be true is if the bottom port was left open so water could fall out with no back-pressure. When installed in your home's water system, the difference between pressure-tank pressure and the back-pressure is what determines flow rate, not the orientation of the UV unit. Orientation doesn't effect this at all. On page 8, it says "Mode AUTO is highly recommended to protect the UV lamp.". Not true and definitely NOT recommended. On page 9, it says the "system is designed for continuous operation, and frequent switching will reduce ultraviolet radiation and service life." which directly contradicts the statement on page 8. I believe this statement on page 9 is correct and you should ignore the AUTO mode recommendation. Don't even purchase the version with the flow sensor so you won't have an AUTO mode in the first place! Note that if your home experiences a power outage, unless you use some kind of uninterruptable power supply, your UV sterilizer will be off and any bacteria and viruses can then pass into your potable water system when you turn on a faucet. Mine is on solar with battery storage so is much less of a problem but I still may add a UPS for the UV unit. Lastly, I DO highly recommend this unit after seeing the bacteria test results.

Did a lot research before purchasing this UV water filter. The installation was fairly straight forward with a few issues along the way, but nothing that couldn't be fixed quickly. Instructions could be a little better. Had to call for some support and Robert with iSpring was very helpful and quick to assist. Overall very happy with the project.

Update 11/23/23: after another round of failed tubes and replacement bulbs, Customer Service suggested I change the "Smart Flow Switch" to continuous power (i.e. making it a dumb switch). They said that the constant on/off of the bulb caused the bulb to fail very quickly. The good news is it has been 8 months and the bulb is still working fine (after changing the switch so the light is on 24/7). The bad news is I purchased this item over less expensive brands because this had the smart flow switch. With the light powered on constantly, more electricity is consumed and the water gets hot if not run for a few hours. So, if this had been sold as a "dumb switch" driven UV Filter at a similar price point to other brands, it would still have my 5 stars, but for what it was sold as versus what I have, it is only a 3 star item. ------------ I purchased a number of iSpring products to set up a dream filtration system. I'm recently retired and have been wanting to add a water softener and filtration to my house, which gets water from a well here in North Central Florida. Needless to say, it is extremely hard water. Back to the UV filter. This was initially a "nice-to-have" purchase that became a necessity the more I thought about it. Installation was simple (with one caveat). As with all iSpring products, they have videos that cover the product installation better than the manuals. My advice is to read the manual a few times, then watch the video a few times and possible do both again during installation. I wanted to have an easily modified system, so I used Sharkbite connectors in many places. This resulted in a few leaks that I had to deal with. But for this UV Filter, I experienced a leak between the UV housing (at the output) and the Flow Sensor. I tried without teflon tape, then with some, then with a lot, but could not stop a small leak. I contacted iSpring Customer service and worked with Mayra. She was very helpful and the leak was resolved with Mayra's help. First, she suggested I use Blue Monster Teflon Tape and use about 3 or 4 wraps. She also sent me a new Flow Sensor. When I received and installed the new flow sensor with the Blue Monster tape, I noticed that I had shredded the original gasket that goes between the UV Filter and the Flow Sensor. Using the new Flow Sensor, with the new gasket and the Blue Monster tape resolved the leak. So, a big shout-out to Mayra for the help! My second interaction with customer support was due to the UV Filter flashing with an error alert at about 5 to 6 weeks after installation. I contacted Customer Support again and Sean responded quickly. Within a couple days, I had a new ballast, another new Flow Sensor, and a new bulb. Unfortunately, the box was delivered with a bend that resulted in the bulb being shattered. It was packaged well, but just couldn't hold up to the abuse of shipping. Sean was quick to send another ballast (in case it was also damaged), along with two new bulbs (all were in great shape). Again, I received them quickly. Installing the new ballast and a new bulb resolved the issue and all is working as it should. Upon closer inspection of the original bulb showed that one of the cathode filaments was bouncing around in the bulb, so it probably broke or burned out, causing the error. So a huge shout-out to Sean for the quick responses, the quick shipments, and for touching base with me along the way to make sure I received the items. I have reviews to complete for the other iSpring products I purchased, some without any issue, and a couple with minor issues that iSpring Customer Support jumped right in to correct or to answer my questions.

This uv filter is solid built. It came well packaged but some parts ( O-rings) were missing. Kudos to their customer service representative Michele who quickly resolved this. Once the o-rings arrived, I installed the filter connecting it to the main line from the pressure tank so clean water supplied to the whole house. Be carefull when assembling the filter - the glass tube and uv lamp are very long and fragile. Instructions are easy to follow. Installed it vertically resting on the floor - this filter is very heavy and I didn't trust the plastic fasteners. Had to reduce the water pressure in my tank because the quartz glass tube seems can't handle more than 43 psi. Turned the uv lamp to auto mode. Will see how long it is going to last. Water test results came clear, so this stuff works. P.S. be generous with teflon tape for plumbing and have a 2 or 3 large towels ready in case you have leaks after the test and need to correct or retighten the connections.

I purchases the whole house system from iSpring a little under a year ago. This UV light was installed with the whole house system. After a few months the UV light blew. I contacted support and a guy named Nick was fantastic. With no hesitation he offer to send me a new UV bulb for the system. All I had to do was send him a copy of my invoice. I am very please with the product and outstanding support. Thank you iSpring.

I purchased this product to ensure that my water is safe for my family. Sean helped me and answered all my questions. Great support.

Constant battle with this thing. Keeps giving me errors. The customer support is great, but they have replaced the bulb, and the balast but it still ends up giving errors. And these bulbs are not cheap. Shipping them is a treat as well. If you sneeze near them they break.

We added the iSpring UVF55FS Whole House UV Water Filter to our whole home Ispring filtration system. Initially we may have experienced a flow switch problem as an error light would blink and sound when the unit sat idle. We contacted the company and immediately received assistance from Julius who worked with us daily as we tried to identify the issue. He then shipped us out some new components and once installed have had no issues and the unit works perfectly. Customer service was amazing!