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

The product is well packed and comes with everything needed to add to your water filtering/treatment system other than some adapters specific to your plumbing. I used PEX B for my install, so just needed to add 1" PEX B to NPT couplings to make the connections. I'm new to well water and had some questions about product selection and Nick handled them quickly, as well as shipping me out a replacement washer for the water flow sensor (I think I over-tightened that connection and it led to a slow leak). Very happy with the rapid help and support from iSpring!

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.

Awesome heavy duty Uv light solved my contamination worries ,installed pre filter and two stage before Uv water quality is 100% better than it was . It did develope a leak on the flow switch contacted ispring , hands down best customer service I’ve dealt with no back and forth just straight forward .Sean took care of it sent a new switch and ballast along with a new bulb

This review is more about the customer service from iSpring than the product itself. Although the actual filter seems to work just fine and was packaged well. Despite this, I recieved a damaged light bulb and reached out to iSpring customer service. I spoke with Robert who was more than helpful. He quickly, politely, and professionally handled this issue and gave me cofidence to buy other products of theirs. It is nice to reach out to a company and find they stand behind their products and make any problems right.

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!