800 GPD tankless reverse osmosis with 7 stages of filtration and alkaline remineralization. Fresh, pH-balanced drinking water on demand — no storage tank needed.
Traditional RO systems store water in a tank. The HW800 AlkaPro produces purified water on demand — fresher, faster, and with more stages of filtration than any standard system.
No storage tank taking up cabinet space. Fresh water on demand, every time.
High-output membrane produces up to 800 gallons per day — enough for any family.
Adds healthy minerals back to raise pH and improve the taste of your water.
Change filters in seconds without tools. Color-coded for easy identification.
More stages than a standard RO system — each one targeting specific contaminants for the purest, healthiest water possible.
Removes sand, rust, and particles
Removes chlorine, taste, and odor
Polishes water, removes VOCs
Removes 99% of dissolved solids
Final taste and odor polishing
Adds minerals, raises pH
Kills bacteria and viruses
| Feature | HW800 AlkaPro (7-Stage) | Standard Tank RO |
|---|---|---|
| Storage tank | None — direct flow | 3–4 gallon tank |
| Wait time | None | May empty with heavy use |
| Daily capacity | 800 gallons | 50–75 gallons |
| Cabinet space | Compact | Tank + filters |
| Water freshness | Always fresh | Sits in tank |
| Best for | High usage, large families | Standard households |
Filter Schedule: Sediment & carbon: 6–12 months. RO membrane: 2–3 years. Alkaline: 6–12 months.
Yes — reverse osmosis is the most effective consumer technology for removing PFAS "forever chemicals." The EWG found PFOS at 5× their health guideline in Raleigh's water supply. The HW800 AlkaPro's RO membrane removes over 99% of PFOA, PFOS, and other PFAS compounds by forcing water through a semi-permeable membrane at high pressure. No other countertop filter, pitcher, or carbon-only system matches RO's effectiveness against PFAS. The 7-stage design adds a UV sterilizer and alkaline remineralization stage on top of the core PFAS removal, giving you the most comprehensive drinking water protection available.
The main differences are production capacity, storage design, and filtration stages. A standard 5-stage RO stores purified water in a 3–4 gallon pressurized tank and produces 50–75 gallons per day. The HW800 AlkaPro produces up to 800 gallons per day with no storage tank — water is purified on demand and delivered instantly without sitting in a tank. It also adds two additional stages: an alkaline filter that adds back healthy minerals (calcium, magnesium, potassium) and raises pH, and a UV sterilizer that kills bacteria and viruses. For families with high drinking water consumption or anyone who dislikes the flat taste of standard RO water, the 7-stage is the clear upgrade.
The HW800 AlkaPro uses quick-change cartridges that require no tools and take about 30 seconds each to swap. The sediment and carbon pre-filters (stages 1–3) need changing every 6–12 months depending on your water quality. The alkaline remineralization filter lasts 6–12 months. The RO membrane itself lasts 2–3 years. The UV lamp should be replaced annually — the system has an indicator light that alerts you when it's due. We include a filter schedule card with every installation and send annual reminders to our Raleigh customers.
RO systems do produce some wastewater — that's unavoidable due to how the membrane works. Traditional tank-based RO systems typically have a 3:1 to 4:1 waste ratio, meaning they send 3–4 gallons of water to the drain for every 1 gallon purified. The HW800 AlkaPro is more efficient, typically operating at a 1.5:1 to 2:1 ratio. At average drinking water consumption for a family of 4 (roughly 3–5 gallons of drinking/cooking water per day), the waste water usage is minimal and not something most homeowners notice on their water bills.
The HW800 AlkaPro installs under your kitchen sink and connects to your existing cold water supply line, with a drain connection to your sink drain. A dedicated RO faucet mounts on the sink deck or countertop — it comes in chrome, brushed nickel, matte black, and brushed gold finishes. Installation typically takes 1.5–2 hours when done alongside a whole-house system, or 2–3 hours as a standalone. We include all hardware, tubing, and fittings. The faucet hole in your sink is typically standard 1-3/8" — if your sink doesn't have a spare hole, we can discuss options.
Same-week installation, lifetime warranty.