Watts Premier 50 GPD RO Membrane Replacement Filter 1-Pack Yellow | Fits 4Sv 5Sv ZeroWaste Reverse Osmosis Systems Built-In Check Valve 1.8 Inch X 10.75 Inch Reduces TDS Arsenic Lead Radium

This filter is a must for WATTS 5 stage RO (WP5-50) to drop the TDS and PPM!!! My Watts RO is about 10 years old that I originally bought from Amazon and it still works great; I have gone through two faucets, two water tanks and about 2-3 of these RO membrane filters but the system works great.This 50GPD membrane is the heart of the RO system as it plays a key role in removing TDS and sodium as well as a wide range of contaminants such as arsenic, lead, chlorine, chromium, copper etc. reducing impurities down to 1/10,000 of a micron from the water that passes through the sediment and carbon filters first. Hence this membrane filter only needs to be replaced once every 2-3 years depending on your TDS levels while the other ones need replacement every 6-12 months again depending on your local water source. My area has good water and hence our filters last more than a year sometimes.I purchased a cheap TDS meter and tested my tap water at 35 PPM, while the water from the old RO filters at 31 PPM. But after changing all the filters 4 filters it came down to 2 PPM after discarding about 2 tanks of water.Overall, a very good system and filter!!!

DESCRIPTION> Color: yellow. All yellow Premier filters are the same size and fit in the same housing. They come in 18, 24, 36, and 50 g/d capacities. You need to match the capacity to your system. My understanding is that if you install a higher capacity membrane, you may have to add a flow limiter to your system. As it turned out for me, my old membrane was a 36 g/d membrane---but the system seems to work well with the 24 g/d membrane. Note also that the black rubber gasket of my 10-year old membrane was at the other end, but does not seem to matter.> This filter is 24 gallons per day, which you should check to see if it matches your existing system.> Genuine Watts #11009---which is important because Watts membranes have a built-in check valve. If you use a non-watts membrane, you may have to add a check-value to your system.> Measurements: 11 1/2" long overall; body 1 3/4" diameter; to fit in a 2" diameter tube> Comes with instructions, which aren't great. But did not exactly apply to my 25-year old Watts Premier system, because the housing of more modern Premier RO systems has been redesigned. I needed to grab the end of the old filter with pliers to pull it out. One end has two O-rings (shown in the photo on the far lower right), the other does not have O-rings but is notched. Pay attention to which way your old membrane was installed. It is as good idea to take photos with your cell phone for each step in disassembly.SUGGESTIONS> Consider replacing all the other filters at the same time---you'll get more life out of the membrane.> I suggest that you start any maintenance by cleaning the black waste-line (so that later cleaning will not accidentally contaminate your new filters). See below.> Consider replacing your tank at the same time---the rubber diaphragm in the tank has a limited life (probably 5--10 years).> Silicon grease is perfect for lubricating the O-rings for the best seal. However, you don't want silicon grease to leach into your drinking water. So if you use silicon grease on the O-rings, be sure to wipe off all excess---just a few molecules thick will do the job. Permatex PERMATEX DIELECTRIC GREASE 22058> Silicon grease is also helpful on all the "threads" where the filter housings screw together---it allows you to easily tighten them tighter that you could easily otherwise---and when it comes time to replace the filters, the housings should unscrew easier.PREMIER RO WASTE-LINE MAINTENANCE---a good idea to do before you install the membrane filter.> After about 6 months of use, the black waste-water tube can become clogged with a bacterial mat. If you pay attention, there is an odd choking gurgling sound when the tube is almost clogged. When it is clogged, the waste water will leak from the faucet itself out onto your counter. The solution (i.e., to prevent clogging of the line) is to regularly clean-out the black waste-water line. An 18" length of "weed-whacker" cord works well. Detach the black tube from your sink waste-line, and feed the "weed-whacker cord" into the tube and scrub it out. If you've had a root-canal procedure, you know how it's done. Note that the bacterial mat is a nasty sludge---have an old cloth towel handy to catch the gunk.> About 1 1/2 years ago I purchased a "beer line brush" Draft Beer Line Hose Cleaning Brush: 3/16" diameter, which worked well the one time I used it (the 1/4" diameter model might work better). However, it also occurred to me that I could squirt a few drops of Clorox into the air gap to prevent the bacterial mat from forming. Since I've been doing that once every few months, the waste line has not clogged up, so, I haven't needed to use the brush. The following bottle, which works well for this purpose is $3 at the Container Store Nalgene Plastic Drop Bottle. A Beachcombers! 1/2 Oz & 1oz Soft Squeeze Fine Metal Tip Moroccan Blunt Needle Syringe Type Body Art Henna Tattoo Applicators, 5 Tips 4 Bottles would probably be even better.> The air gap is literally a "gap", that is, an open space, or "well", located is beneath the lever, opposite the giraffe neck. For access to Premier faucets with flat sides (without an access hole on the side), pull the giraffe neck straight up and out, then slide the lever forward (in the direction of the giraffe neck). Drip few drops of Clorox into the "well" Do NOT disturb the small black plastic insert---it is the tiny "faucet" where the red water line discharges "brine" into the air gap or "well". To reassemble, push the lever backward (in the direction of the air gap), so that the legs slide under the "T", and then push the giraffe neck back into place. In Premier faucets which have domed bodies (without the flat sides), the air gap is accessible via a hole on the same side as the lever---perhaps for the very purpose of making the air gap easier to sanitize. If you install a domed-body faucet with the lever toward the sink, the hole is most easily accessible.> Click on “Stoney” just below the product title to see my other reviews, or leave a comment to ask questions.

Overall a good maintenance item and relatively easy to to replace but not simple. System is for a low water use and the water had low TDS but it had been about 6 years since installation. RO filter was discolored but basically the TDS was the same before and after change out. Order TDS meter to check your system.Update for May 2026 Replaced after 3 years. I changed out every component in my 25 year old system because the faucet was constantly gurgling. Changing ASO which did not help. Seems that the RO membranes internal check valve became dislodged and fell out of the housing during replacement. After changing RO membrane and all of the filter it works perfect. About 75% sure it was the internal valve issue but it could have been something else. Just keep in mind that it could be the RO Membrane; however, internet searches never mentioned it as a cause of the gurgling. FYI changing the Membrane every 3 or 4 years is probably a good idea.I Attached photo of small housing with spring and plunger type valve that fell out in case anyone has a similar issue.

Watts Premier membrane is a great product, good price/value

Works as expected, good price and last about 4 years with softner installed. Ensure you get the right one for your specific filtration system otherwise it will not produce any filtered water.

This is the original spare part for your Watts RO system. In my case my old membrane had been used for about 4 years with a light to medium demand. So I decided to change.Note for watts filters: I had expirienced low water production with low water pressure and a constantly running (drain) system. So I started changing the carbon and sediment filters. No improvement. Changed the auto shut off valve (ASOV). No improvement. Dismantled everything to check for blockage. No problem to be found. As a last resort I changed the membrane and everything came back to normal. Great tasting water with a lot of pressure and a lot of it. So if your system is constantly running you might want to change the membrane. The system rubs on a very sensitive balance if pressures. A blocked membrane can cause several problems. Change yours as often as needed. They are cheap and extremely easy to change.

Our city water reads 126 TDS. We got 5 TDS coming out of a five stage R/O system, so I added a resin filter and a one micron final cartridge. That brought the drinking water down to ZERO TDS with absolutely no taste whatsoever. Only time and flow will determine how soon we will need to replace the resin or one micron cartridge, but since they only feed the drinking water faucet and the fridge, they should last quite a while.

Installed this to revitalize a very old school Premier/Watts WP-4V system that I got for free. Flow rate is perfectly acceptable, though, I am a low-demand user. The most I would ever ask of my system at one time is to fill up a 54oz water bottle, and I have auxiliary 3gal bottles off to the side so I'm really never like... Running up against the membrane filter itself, I'm just decanting from the 3gal pressure tank in my RO system.Filtering performance... The worst I have seen out of my unfiltered tap is 305TDS... Through my RO system (including post-filter) I get between 22 and 31. Tastes phenomenal!Has nothing to do with the filter itself but I will add that the Premier H2o company is top-tier, they have friendly phone support, they have a huge library of troubleshooting guides.

I found Amazons price 1/2 of Costco.ca making this a great purchase. According to Watts Premier support their manufacturing process has changed. Starting in late 2017 their R/O Membranes now contain a thicker outer diameter wrap which extends 'shelf life' concern, for the most part. Instead of 18-24 months, your are now looking at 4-5yrs. Not sure if these are the newer models but for price I could not turn it up.

Buena calidad

La livraison fut très rapide et l'installation a aussi été très facile. Le test de l'eau a été ensuite pris et les résultats sont tels que prévus. Je suis parfaitement satisfait et recommande d'acheter la membrane osmotique.

Delivered on time, perfect fit, clear instructions, working very nicely. Very satisfied.

I would have to have my water tested to respond to the quality of the product, but I can tell you that it fit my Watts Premier Reverse Osmosis water treatment system, model, WP5-50 well, along with the Watts 7 pack of RO replacement filters. I had a plumber install them and he had no problems whatsoever, so that is a saving right there, as they charge by the hour! I was worried they would not fit before I ordered because the manual recorded four different models. I’m a happy camper, so I don’t think I will ever try generic brands in the future!