Alkaline water is water with a pH above 7, typically ranging from 8.0 to 9.5 in residential systems. The marketing claims for alkaline water include anti aging effects, cancer prevention, improved hydration, and immune support. The scientific evidence for most of these broad claims is not yet conclusive, as Mayo Clinic, Cleveland Clinic, and the scientific literature consistently note. What is well established: limited peer reviewed studies suggest alkaline water may reduce acid reflux symptoms and may support bone density in some populations. The primary reason most North Carolina homeowners choose an alkaline reverse osmosis system is not the pH itself but what the RO stage removes from NC tap water: chloramines from Raleigh and Durham city water, seasonal chlorine from Charlotte and Greensboro, lead from legacy plumbing, PFAS from Cape Fear basin sources, and a range of other dissolved contaminants the RO membrane rejects at 95 to 99 percent efficiency. The alkaline remineralization stage then adds beneficial calcium and magnesium back in a clean, controlled form. Call Aquafeel Solutions Carolina at (984) 358-2512 for a free in home water test.
Aquafeel Solutions Carolina installs alkaline RO systems across NC and upper SC. This article is the honest version of the conversation our technicians have during free in home water tests: what the system actually does, what the science supports, and what the marketing overstates. We do not sell alkaline water on the basis of unverified health claims. We sell it because it is the best-tasting and most contaminant-free option for NC kitchen tap water, and the alkaline pH is a genuine if modest additional benefit. See city-specific pages for Raleigh, Charlotte, Durham, Greensboro, Columbia SC, and Greenville SC.
Is Alkaline Water Actually Better for You?
The honest answer from Mayo Clinic and Cleveland Clinic: the evidence for broad alkaline water health claims is not established. There is no peer reviewed evidence that alkaline water prevents cancer, slows aging, or provides the immune benefits that many commercial alkaline water products claim. Anyone marketing alkaline water products on the basis of these claims is ahead of the science.
What limited peer-reviewed research does suggest: a 2012 study published in the Annals of Otology, Rhinology and Laryngology found that alkaline water at pH 8.8 may help neutralize pepsin, the enzyme activated by acid reflux. A 2016 study in the Journal of the International Society of Sports Nutrition found that high-pH water improved blood flow and hydration markers after exercise in a small cohort. A 2021 observational study in the journal Nutrients found associations between alkaline water consumption and improved metabolic markers in postmenopausal women. Verify these and current research through the NIH PubMed database. None of these studies are conclusive; all require replication. Discuss any health-specific decisions with your physician before making medical decisions based on water pH.
How Does an Alkaline RO System Work?
An alkaline RO system combines standard reverse osmosis filtration with one or two additional stages that modify the pH of the purified water:
- Sediment pre filter (5 to 50 micron). Removes particulates, rust, and sediment before the RO membrane to protect it from clogging.
- Carbon pre filter (activated carbon or catalytic carbon). Removes chlorine, chloramines, VOCs, and some organic compounds before the membrane. Catalytic carbon is required for chloramine removal; standard carbon removes chloramines only partially.
- RO membrane (0.0001 micron pore size). Rejects 95 to 99 percent of all dissolved solids including hardness minerals, chloramines that passed the carbon stage, lead, arsenic, PFAS, nitrates, and most dissolved organic compounds. The membrane produces essentially pure water.
- Carbon post filter. Polishes the taste of the purified water after the membrane.
- Remineralization stage (alkaline stage). The RO membrane removes all minerals including beneficial calcium and magnesium, leaving slightly acidic water with a flat taste. The remineralization stage passes the purified water through a bed of calcite (calcium carbonate), coral, or ceramic alkaline mineral media. Calcium and magnesium dissolve back into the water at controlled, nutritionally relevant levels. The process raises the pH to 8.0 to 9.5 and restores the mineral taste that makes spring water pleasant to drink.
The result is water that has been completely purified by the RO membrane and then re-enriched with beneficial minerals. The RO stage does the environmental work (removing contaminants). The alkaline stage does the taste and mineral work. Together they produce water that tastes better than standard RO and far better than untreated NC city water, with a mild alkaline pH.
What pH Is Alkaline Water and Does It Matter?
Alkaline water typically tests at pH 8.0 to 9.5, compared to neutral water at pH 7.0 and typical NC tap water that ranges from pH 7.2 to 8.2 (utilities adjust pH upward to minimize lead pipe corrosion). Standard reverse osmosis water without a remineralization stage tests at pH 5.5 to 6.5, slightly acidic because the membrane removes the alkaline minerals that were buffering the pH.
The remineralization stage lifts the pH from 5.5 to 6.5 (plain RO) up to 8.0 to 9.5 (alkaline RO). Whether this specific pH level matters to health outcomes beyond the reflux and bone density studies mentioned above is not established. What is established: water at pH 5.5 to 6.5 does not taste as pleasant as water at pH 7 to 9 to most people, because the very low mineral content that drives the low pH also causes the flat taste. The remineralization stage improves taste and texture independent of any health benefit from the pH itself.
Do I Need Both a Water Softener and Alkaline RO in NC?
This depends on your water profile. For most NC city water homes:
- At 4 to 6 GPG (Raleigh, Durham, Chapel Hill): An under sink alkaline RO alone is usually sufficient. The softness of Triangle municipal water means scale damage to appliances is relatively low. The alkaline RO handles drinking water quality. If you see any scale on fixtures or notice water heater efficiency decline, adding a softener is straightforward.
- At 6 to 10 GPG (Charlotte, Greensboro, most Triad cities): A whole house softener plus alkaline RO under the kitchen sink is the recommended combination. The softener protects appliances across the whole home. The alkaline RO handles drinking water quality and removes the softener sodium from drinking water via the RO membrane.
- NC private well water (8 to 25 GPG, often with iron and sulfur): A multi-stage treatment train is required: iron filter, softener, and RO or alkaline RO at the drinking water tap. See our well water guide.
- Greenville, SC city water (2 to 5 GPG): Alkaline RO alone. No softener needed for Greenville Water utility supply.
The free in home water test measures your actual tap chemistry and provides a specific recommendation for your address and household. See our reverse osmosis vs water softener comparison guide for the full decision framework.
What Does an Alkaline RO System Cost in North Carolina?
Under-sink alkaline RO systems installed by Aquafeel Solutions Carolina in NC typically run $800 to $1,800 for the unit plus installation, depending on the number of filtration stages and whether a simple calcite remineralization stage or a more advanced ionization stage is included. Annual filter replacement cost runs $80 to $180 for a 3 to 4 person household. RO membrane replacement every 3 to 5 years runs $120 to $200. Compare to premium bottled alkaline water at $1 to $4 per gallon: a typical family of 4 consuming 2 gallons per day of premium bottled water spends $730 to $2,920 per year on bottled water alone. The alkaline RO system pays back this cost within 6 to 18 months of installation at that consumption rate. See our city-specific pricing guidance for Raleigh and Charlotte.
Frequently Asked Questions
Is alkaline water actually better for you?
Limited peer reviewed evidence suggests alkaline water may reduce acid reflux symptoms and may support bone density in some populations. Broad claims about anti aging, cancer prevention, and immune benefits are not scientifically established. Mayo Clinic and Cleveland Clinic both note the evidence is insufficient for these broader claims. The primary benefit for NC homeowners is the RO stage removing chloramines, lead, and PFAS from tap water, not the alkaline pH itself. Discuss health-specific decisions with your physician.
How does an alkaline RO system work?
An alkaline RO system first pushes water through a semipermeable RO membrane that removes 95 to 99 percent of dissolved contaminants. It then passes the purified water through a remineralization stage (typically calcite or ceramic alkaline media) that dissolves calcium and magnesium back into the water, raising the pH to 8.0 to 9.5. The result is clean, contaminant free water with a natural mineral balance and pleasant taste.
What pH is alkaline water?
Alkaline water typically tests at pH 8.0 to 9.5, compared to neutral water at pH 7.0. Standard RO water without remineralization tests at pH 5.5 to 6.5, slightly acidic because all alkaline minerals are removed. The remineralization stage lifts the pH back above 8 by adding calcium and magnesium back in controlled amounts.
Do I need both a water softener and alkaline RO in NC?
For most NC city water homes at 6+ GPG (Charlotte, Greensboro), yes: the softener protects whole-home appliances and the alkaline RO handles drinking water quality. For NC Triangle cities at 4 to 6 GPG (Raleigh, Durham), alkaline RO alone is often sufficient. For Greenville SC at 2 to 5 GPG, alkaline RO alone handles everything. A free in home water test determines the right combination for your specific address.
Schedule a free in home water test or call (984) 358-2512. Browse alkaline RO service: Alkaline RO Service, Alkaline Water Systems. External references: Mayo Clinic on alkaline water, NIH PubMed alkaline water research database.
