Henry Novell
★★★★★
Google review
“Good company. Answered every question I had.”
After a Hague water softener and reverse osmosis installation.
Vertex Water Products
Vertex IsoTwist Reverse Osmosis System
Here's the uncomfortable truth. You can already have a filter, and still be drinking the stuff you were trying to filter out. Most filters catch the big, obvious things and let the small, dangerous ones slip right through. Reverse osmosis is the fix, and the IsoTwist packs five stages of it into a system that hides under your kitchen sink.
5-stage reverse osmosis
Up to 50 gallons a day
Twist-off filters
IAPMO Platinum certified
Made in the USA
Tap the image to view it full size
Why this one exists
A filter that looks clean and a glass that is clean are two different things.
We see it in homes from Mission Viejo to Fountain Valley all the time. Someone's got a pitcher in the fridge, or a little cartridge screwed onto the faucet, and they figure they're covered. The water looks fine, tastes okay, so why wouldn't they be? Here's the part nobody told them. Most filters were never built to catch the dangerous stuff.
Picture a fishing net with big holes. It stops the big fish and lets the minnows swim clean through. That's a basic filter with things like arsenic, lead, fluoride, and nitrates. Those are dissolved so far down that a carbon cartridge waves them right past. No taste, no smell, no warning. You could run an inferior filter for years and never once know what slipped into your glass.
Reverse osmosis is the answer, and it's not a small upgrade. Instead of a net, it uses a membrane so fine that only water molecules squeeze through and almost everything else gets left behind. The Vertex IsoTwist wraps five stages of that around a compact under-sink system, makes up to 50 gallons of clean water a day, and keeps it waiting in a pressurized tank so it's ready the second you turn the handle. It's not a quick fix on a shelf. It's real protection, the kind you stop thinking about because it just works.
How it actually works
Reverse osmosis, explained the way I'd explain it at your kitchen table.
The phrase sounds like a chemistry exam. It isn't. Once you picture it, the whole thing makes sense, and almost nobody bothers to walk you through it. So here it is in plain English.
Start with the screen door. It lets air through and keeps the bugs out, because the holes are the right size for one and not the other. Now imagine a screen so unbelievably fine that the only thing small enough to pass is a water molecule. That's a semipermeable membrane, and it's the heart of reverse osmosis.
To get water through a screen that tight, the system uses your home's water pressure to push it. The pure water squeezes through to the other side, and the contaminants, the lead, the arsenic, the fluoride, the nitrates, the dissolved solids, get left behind and rinsed away. That's the "reverse" part, water being pushed the hard way, on purpose, to leave the junk behind.
The IsoTwist doesn't rely on the membrane alone, though. It runs five stages in sequence. Sediment and grit come out first, so they don't clog what's downstream. Then carbon strips the chlorine and the taste and smell that ride with it. Then the membrane does the heavy lifting on the dissolved contaminants. Then a final polish on the way to the tap. Each stage clears the road for the next one, which is why a multi-stage system reaches so much more than any single filter.
One more thing worth knowing. This is a point-of-use system, meaning it treats the water right where you drink it, at the kitchen sink, and stores it in a 4 gallon pressurized tank so there's clean water ready on demand. Turn the dedicated faucet, and out it comes.
At the tap
What actually changes, once the drinking water is right
This isn't a whole-house system, and it doesn't pretend to be. It goes where it matters most: the water you and your family actually swallow. Here's where you'll notice it.
The first glass of water
The chlorine tang is gone, the faint metallic edge is gone, and what's left just tastes like clean, cold water. This is the change people notice on day one, and it's the one that gets the whole family drinking from the tap instead of hauling plastic bottles in from the store.
Coffee, tea and cooking
Your morning coffee is mostly water, so it tastes like whatever you brewed it with. Clean water in means the coffee tastes richer and the tea tastes brighter. Soups, rice, pasta, anything you cook in water comes out with the true flavor instead of a chlorine undertone.
The ice and the fridge line
Cloudy, off-tasting ice usually means the water it froze from was off too. Clean reverse osmosis water makes clear ice that doesn't flavor your drink, and plenty of homes run the line to the refrigerator so the door dispenser pours the good stuff too.
The bottled water habit
Here's the quiet one. Families spend a small fortune on bottled water every year, plus the hauling, the storing, and the recycling. With clean water on tap, that habit just stops. You refill a reusable bottle and move on, and the savings add up faster than the system costs.
What you stop worrying about
This is the part that doesn't show up in a taste test. Knowing that lead, arsenic, and the other invisible contaminants are being handled means you quit second-guessing the tap. Peace of mind is a strange thing to put a price on, but every family that switches mentions it.
The counter space you get back
No more cases of water stacked in the garage or the pantry, no pitcher taking up a fridge shelf and always needing a refill. The IsoTwist lives out of sight under the sink, and the only thing on your counter is the little dedicated faucet.
What's in the system
The six things that make it an IsoTwist
The features that matter, with a plain note on why each one actually earns its keep once it's tucked under your sink.
5-stage filtration
Not one filter, a relay team. Each stage targets something different, and together they reduce up to 13 contaminants. Sediment first, then carbon, then the reverse osmosis membrane, then a final polish. It's a thorough scrub, not a single pass.
Up to 50 gallons a day
This is a workhorse, not a trickle. It makes far more clean water than a household drinks and cooks with, which means drinking, coffee, ice, and the dog bowl all come from it without you ever thinking about capacity. Plenty for a busy family or a small office.
Twist-off filters
The feature people end up loving most, and it's right in the name. When it's time, the old filter twists off and the new one twists on. No wrench, no shutoff drama, no puddle under the cabinet. If you can open a jar, you can do this.
4-gallon pressurized tank
You don't wait for reverse osmosis water, because it's already made and waiting. The system fills a pressurized tank in the background, so clean water is there the instant you turn the faucet, day or night, no lag.
Compact under-sink design
Kitchen space is precious, especially in a lot of Orange County homes. The whole system is built to tuck neatly into the cabinet under the sink, taking up less room than you'd expect and leaving your counters clear.
US-built and IAPMO Platinum certified
This isn't a mystery box from a marketplace. It's built in the USA and carries the IAPMO Platinum Seal, an independent, tested-and-proven mark for safety and performance. You're trusting a certification, not a promise.
The five stages, explained
What each stage does, in the order the water hits it
This is where "5-stage" stops being a brochure number and turns into something real. Water runs through these one after another, and each stage sets up the next.
Stage 1, Sediment pre-filter
Catches the big stuff first, sand, rust, dirt, and grit, so it can't clog the finer filters downstream. Think of it as the doormat before the front hall.
Stage 2, Carbon pre-filter
Carbon grabs chlorine and the chemicals that ride with it. This also protects the membrane, which chlorine can damage over time, so it does double duty.
Stage 3, Second carbon stage
Another carbon pass takes out more chlorine, taste, and odor before the water reaches the membrane, so what hits the heart of the system is already cleaner.
Stage 4, Reverse osmosis membrane
The heavy lifter. The semipermeable membrane reduces the dissolved contaminants a normal filter can't touch, lead, arsenic, fluoride, nitrates, and more.
Stage 5, Final carbon polish
One last pass on the way to the faucet removes any lingering taste from the tank, so the water in your glass tastes as clean as it is.
Stored in the pressurized tank
After the five stages, clean water waits in the 4 gallon pressurized tank, ready on demand. Turn the dedicated faucet and it's right there.
Every stage matters, but the membrane is the one that separates real reverse osmosis from a fancy carbon filter. That's the piece a pitcher or faucet filter simply doesn't have, and it's the reason the IsoTwist reaches contaminants they never will.
The numbers
The IsoTwist specs, so you can hold it up against anything else
Most water company sites won't lay this out for you. Here it is, plainly, so you're comparing apples to apples with whatever else you're looking at.
| System type | Under-sink reverse osmosis drinking water system |
|---|---|
| Filtration | 5 stage filtration process |
| Daily output | Up to 50 gallons of purified water per day |
| Storage | 4 gallon pressurized tank, clean water on demand |
| Contaminant reduction | Reduces up to 13 contaminants, including lead, arsenic, fluoride, chlorine and nitrates |
| Filter changes | Twist-off filters, no tools required |
| Filter life | Typically 6 to 12 months, depending on use and incoming water |
| Installation | Compact under-sink design, typically installed in under an hour |
| Certification | IAPMO Platinum Seal certified |
| Assembly | Built in the USA |
The one thing worth confirming in person is your water itself. Two homes on the same street can read differently at the tap. Before we recommend anything, a McCowin technician tests your actual water, hardness, chlorine, total dissolved solids, and the rest, and writes the numbers down for you. That way the system is matched to what's really coming out of your pipes, not a guess based on the zip code.
Local context
How it lines up with the water we've actually got here
We work one county on purpose, so we can be specific about this instead of hand-wavy.
City water here is chlorinated, and then some. Orange County tap water is treated to be safe to deliver, which means chlorine, and it carries a load of dissolved solids that vary neighborhood to neighborhood. Chlorine you can taste. The dissolved contaminants you usually can't. Reverse osmosis at the kitchen tap is the straightforward way to take drinking and cooking water down to genuinely clean, no matter what the street is sending, whether you're in Irvine or Huntington Beach.
Homes on wells have a different worry. Out toward the canyons, some homes pull from private wells, and wells can bring nitrates, arsenic, and other dissolved contaminants that no pitcher touches. A point-of-use reverse osmosis system like the IsoTwist is a common answer for safe drinking water in exactly those spots. On a well we always test first, because no two read the same.
It pairs with a softener, it doesn't replace one. Plenty of homes here run a whole-house softener for the hardness and add reverse osmosis at the kitchen sink for drinking water. They do two different jobs. If you're weighing both, we'll lay out how they work together at the test, no upsell.
We stay in Orange County for a reason. One county means the crew already knows how the water behaves from Irvine down to the coast, so nobody's learning your neighborhood on your dime. Our trucks are in these towns most weeks.
Irvine
Tustin
Newport Beach
Costa Mesa
Santa Ana
Mission Viejo
Lake Forest
Laguna Niguel
Huntington Beach
San Clemente
Our shop is at 222 Goddard in Irvine and our trucks run daily, so most appointments land the same week.
IsoTwist or a basic filter
Reverse osmosis versus the pitcher and the faucet filter, honestly
People ask us this constantly, so here they are side by side instead of pretending the cheaper options don't exist. They have their place. They just aren't the same job.
| Vertex IsoTwist reverse osmosis | Pitcher or faucet filter | |
|---|---|---|
| How it filters | 5 stages, including a reverse osmosis membrane | Single carbon stage, no membrane |
| Chlorine, taste, odor | Yes | Usually yes |
| Lead, arsenic, fluoride, nitrates | Reduces these dissolved contaminants | Generally not designed to |
| Water ready to use | Up to 50 gallons a day, held in a pressurized tank | Limited to what the pitcher holds, refill and wait |
| Upkeep | Twist-off filters, roughly every 6 to 12 months | Frequent cartridge swaps |
| Where it lives | Out of sight under the sink, dedicated faucet | On the counter or the faucet, in the way |
| Certification | IAPMO Platinum Seal, built in the USA | Varies widely |
Here's the honest version. A pitcher filter is fine if all you want is to knock the chlorine taste off a glass of water, and it costs almost nothing. But if you actually care about the contaminants you can't taste, the lead and arsenic and nitrates, a basic filter was never built for that fight. That's the whole reason reverse osmosis exists. If you just want better-tasting water, a pitcher will do. If you want water you truly trust, this is the one.
The honest part
Who this suits, and who it doesn't
It's probably right for you if you care about what's actually in your drinking water, not just how it tastes. If you're tired of buying bottled water, or you've got kids drinking from the tap, or you just want to stop wondering what a basic filter is letting through, this is built for exactly that.
It's probably not the whole answer if your main complaint is hard water, scale on the fixtures, spots on the glasses, dry skin after a shower. That's a whole-house softener's job, not a drinking-water system's. Lots of homes run both, and we'll tell you honestly if a softener is what you really need first.
It's also not for you if you rent, since this is permanent under-sink plumbing, or if you're hunting for a ten-dollar fix from a marketplace. That's a perfectly fair thing to want. It just isn't this.
Thirty minutes at your kitchen sink settles all of it. We test your water, chlorine, total dissolved solids, hardness, and the rest, write the numbers down, and hand them to you whether you buy anything or not. Think of it as a blood panel for your plumbing.
Straight from the source
The manufacturer's own literature
The Vertex IsoTwist product sheet, so you can read the source yourself rather than taking our word for any of it.
Certification and guarantee
What backs it, and who backs what
Two separate things stand behind this system, and it's worth knowing which is which before you buy from anybody, us included.
From Vertex, the manufacturer
The IsoTwist is IAPMO Platinum Seal certified and built in the USA. Certification and any manufacturer warranty terms are set by Vertex, and we'll walk you through the actual documents before you decide anything.
From us, the installer
Our own work is covered under The McCowin Guarantee. And if a manufacturer question ever comes up, we handle it for you rather than pointing you at a phone number and wishing you luck.
The McCowin Guarantee on this system
If the IsoTwist we install doesn't do what we said it would:
- We come out and fix it. No charge.
- If we can't fix it, we pull it out and replace it with a system that does.
The performance guarantee runs one year from your installation date. Service support doesn't expire.
From Orange County homeowners
People who had us put a system in
Installs, plus a few on how the service has gone since. That second part is what really tells you who you're dealing with.
Anita
★★★★★
Laguna Niguel homeowner
“They carry many different manufacturers and can recommend the one best suited for your needs.”
She wanted a system that was efficient and produced the least waste water, and wrote that is exactly what she got.
Kathy Leedom
★★★★★
Irvine homeowner
“He was thorough, answered all my questions, and couldn't have been nicer.”
Brian walked her through the system, then Joel came out to install it and show her how it all works.
Jennifer Hill
★★★★★
Costa Mesa homeowner
“They're so professional and helpful. I feel completely safe with their system in my home.”
She described the team as reliable and trustworthy, and said that's rare these days.
Mike Michino
★★★★★
Google review
“Meticulous, and complete in every detail. They do not cut any corners.”
On his annual service visit. He wrote that the technician walked him through the system so he could handle it himself.
Ethan Blair
★★★★★
Google review
“We have been with McCowin water for 7 years and only encountered positive results.”
Seven years of quoting, scheduling, service and follow up.
Tom Atkins
★★★★★
Google review
“Good company. High integrity.”
Several years as a customer. Brian came out personally on his most recent visit.
Swipe or use the arrows
Questions
What people ask about the IsoTwist
What's actually wrong with the filter I already have?
Maybe nothing. But here's the catch. Most filters, the pitcher in the fridge, the little cartridge on the faucet, the one built into the door, are catching the big obvious stuff and waving the small stuff right through. Think of a fishing net with big holes. It stops the big fish and the minnows swim clean through. Chlorine taste, sure, they help there. But lead, arsenic, fluoride, nitrates? Those are dissolved down at a level a basic filter was never built to catch. So the water looks clean, tastes okay, and you'd never know. That's the part that gets people. You can run an inferior filter for years and never see what slipped past.
What does reverse osmosis remove that a regular filter doesn't?
The dissolved stuff you can't see, taste, or smell. A regular filter is a screen with visible holes. A reverse osmosis membrane is a different animal. It's so fine that only water molecules squeeze through, and almost everything else gets left behind. That means lead, arsenic, fluoride, nitrates, and a long list of other contaminants, on top of the chlorine and sediment a normal filter already handles. The IsoTwist reduces up to 13 different contaminants this way. It's the difference between locking the front door and locking every door in the house.
Will the water taste flat or stripped after reverse osmosis?
Most people say the opposite. What they notice first is that the water tastes cleaner, because the chlorine tang and the faint metallic edge are gone. Reverse osmosis does pull out minerals along with the contaminants, that's just how the membrane works, and a few folks who love mineral water can tell. If that's you, we can talk about a remineralization stage that adds a pinch of good minerals back after the membrane. But honestly, most families pour the first glass, taste it, and never think about it again except to notice the coffee got better.
How much water does it actually make in a day?
Up to 50 gallons a day, which is far more than a household drinks and cooks with. And you're not standing at the tap waiting for it, either. The system fills a 4 gallon pressurized tank in the background, so there's clean water ready the second you turn the handle. Drinking, coffee, cooking, filling the dog bowl, making ice, it all comes from that tank. For a busy family or a small office, running dry basically doesn't happen.
How hard is it to change the filters?
This is the part people actually love, and it's right there in the name. The filters twist off. You turn the old one, it comes off, you twist the new one on. No wrench, no shutting off half the house, no puddle on the cabinet floor. If you can open a jar, you can change these. That's a deliberate design choice, because the number one reason people let filters go too long is that the old cartridge style was a genuine pain. Take the pain out and the filters actually get changed on time.
Is it hard to install, and will it fit under my sink?
Not hard, and almost always yes. The whole system is built to tuck neatly under a standard kitchen sink, and a typical install runs under an hour. We handle it for you, so there's no wrestling with plumbing on your weekend. If your cabinet is unusually tight or your setup is a little different, that's exactly the kind of thing we check during the free water test, before anything gets ordered. We look at the actual spot and tell you straight whether it fits.
How often do the filters need changing, and what does upkeep cost?
Plan on the filters roughly every 6 to 12 months, depending on how much water your home runs through it and what's coming in from the street. There's no expensive maintenance contract to sign, just the filters themselves, and because they twist off, you're not paying anyone to do it. We even send reminders so you're not tracking dates on a calendar. Compared to what a family spends on bottled water in a year, the upkeep on this tends to look small.
Is it certified, and where is it made?
Both boxes checked. The IsoTwist is built in the USA and carries the IAPMO Platinum Seal certification, which is an independent, tested-and-proven mark for safety and performance, not a sticker the maker prints itself. This isn't a cheap import you order in a box and hope for the best. When we recommend it, we're putting our own 50 year name in Orange County behind it, and we'll walk you through the certification before you decide anything.
What contaminants does the IsoTwist actually remove?
Up to 13 of them, and it's the list that matters most for drinking water. Lead, arsenic, fluoride, chlorine, nitrates, plus a range of other dissolved solids and chemicals that a basic filter leaves in the glass. The reason it reaches so many is the reverse osmosis membrane, which filters at a level far finer than sediment or carbon alone. The honest way to know what's in your specific water, though, is to test it. That's what the free in-home water test is for, and it's the step you should never skip.
Find out what's in your water before you buy anything.
Thirty minutes at your kitchen sink tells us whether the IsoTwist belongs in your house, and exactly what your water needs. The test is free, the numbers are yours to keep, and there's nothing to buy.
Or come see one in person at the showroom. 222 Goddard, Irvine, CA 92618. (949) 569-5736. Monday through Friday, 9 to 5.