See the purity, trust the technology. A tankless under-sink system that delivers ultra-pure, clean, refreshing water on demand for you and your family in San Castle.
The System Itself
The whole system fits under your sink and connects with quick-connect fittings. Four quick-change twist cartridges handle the four filtration stages, with a UV chamber inline. There’s no bulky storage tank, so you get purified water on demand—ideal for busy San Castle households.
The first cartridge catches rust, dirt, sand, and larger particles before anything downstream sees them.
Carbon block media that reduces chlorine, odors, colors, and chemicals before the membrane—great for San Castle tap water.
The heart of the system—rejecting dissolved solids and heavy metals and sending the concentrate to the drain.
The final cartridge polishes the water and adds beneficial minerals back for a balanced pH—great for everyday drinking in San Castle.
Filtration Stages
Each stage handles what the one before it left behind. UV is the fourth step in the sequence—and the one stage that isn’t filtration at all. It’s there to address what a filter can’t catch, for added peace of mind in San Castle.
Removes rust, dirt, sand and large particles from your San Castle water.
Reduces chlorine, odors, colors, and chemicals for cleaner-tasting water in San Castle.
Removes up to 99% of dissolved solids, heavy metals, and more (performance depends on San Castle source water).
Kills 99.99% of bacteria, viruses and microorganisms.
Adds beneficial minerals for a balanced, healthy pH.
Four filtration stages plus UV sterilization. Steps 1 to 3 and 5 are the four filtration stages; step 4 is the built-in UV lamp (disinfection, not filtration). It’s included in the price on every system we install in San Castle.
Pricing
The systems are identical—the difference is how many you have installed on the same visit. Every unit includes UV sterilization and professional installation for San Castle homeowners.
1 UnitInstalled
Regularly $2,000 - you save $1,005
The standard install—and the right fit for a kitchen sink in most San Castle homes.
2 UnitsInstalled
A lower price per unit on a two-system install for your San Castle property.
Great for a kitchen and wet bar, a second kitchen, or a guest suite in your San Castle home.
3 or More Installed
Our lowest per-unit price
Ideal for larger San Castle homes, multi-unit properties, and light commercial spaces.
All prices are installed and include UV sterilization, with no hidden fees. Not sure how many you need? We’ll walk your San Castle property with you as part of the visit.
Technical Specifications
The SimPure ROULP-3012-400-T1, from the T1-400 series. A tankless build that produces up to 400 gallons a day on demand, so the water is made when you draw it rather than stored.
400 GPD
Production rate
1.5:1
Pure-to-drain ratio
1,057 gal
Per full cartridge set
99.99%
Maximum TDS reduction
The T1-400 series tankless under-sink reverse osmosis system for San Castle homes.
Typically 95% and up to 99.99%, bringing 200–500 PPM tap water to near 0 PPM, or below 25 PPM (results vary by San Castle source water).
The lamp operates automatically based on water flow pressure, and can be adjusted.
Keeps water fresh, saves under-sink space, and helps prevent secondary contamination—important in humid subtropical Florida.
One gallon of wastewater for every 1.5 gallons of purified water produced.
A complete set of cartridges is roughly the equivalent of 8,000 bottles of water—less plastic headed to the landfill here in San Castle.
One Unit, Installed in San Castle
$995
Installed
Regularly

Unit, all four cartridges, faucet, fittings & all parts—ready for San Castle installs.

The built-in UV lamp is part of the price—not an upgrade.

Fitted under your sink and commissioned by our pros serving San Castle, FL.

We test your San Castle water before and after, so you can see the difference.

No surprises—one low price includes everything in San Castle.

Lower per-unit pricing when we install two or more in your San Castle home.
Independent Testing
You don’t have to take performance on faith. The system has been tested by an independent laboratory against the recognized standard for reverse osmosis drinking water systems—so San Castle families can choose with confidence.
Testing covers the removal of over 99.99% of more than 1,000 contaminants, including total dissolved solids such as fluoride, nitrates and nitrites; PFAS, PFOA and PFOS; heavy metals such as lead and arsenic; and chloride.
Made by SimPure
SimPure is based in Seattle, Washington and has served the USA since 2006, with trained water specialists available for product support.
Reduction performance varies with source water and household usage. Since San Castle water can vary by utility and aquifer, we test your water during the visit so you know what you’re starting from.
Perfect For
It installs at the point of use, so the water you drink and cook with in San Castle is the water that gets purified.
Cleaner Water. Better Living. In San Castle.
Installed by a Florida plumbing company that’s been doing this a long time—and stands behind the work for San Castle homes.
Built with premium materials for reliable, long-term performance in San Castle’s humid subtropical climate.
The built-in UV lamp is included in the price on every unit we install in San Castle.
We stand behind our products and the quality of our service in San Castle.
Join San Castle homeowners who choose Mr. Pure Water for better-tasting water at the tap.
Product Assurances
Better-tasting, odor-free water for drinking, cooking, and everyday use in San Castle.
Tankless purification as you draw—no storage tank and no waiting, ideal for busy San Castle kitchens.
Built-in UV helps eliminate bacteria, viruses, and microorganisms—extra protection for San Castle water.
The Mr. Pure Water Under-Sink Reverse Osmosis System with UV Sterilization is a tankless point-of-use system that fits neatly under your sink with quick-connect fittings—great for San Castle homes. Cold water enters a PP sediment cartridge that catches rust, dirt, sand and large particles, then a CTO carbon block that takes out chlorine, odors, colors and chemicals. The reverse osmosis membrane removes up to 99% of dissolved solids and heavy metals, sending the concentrate to the drain at a 1.5:1 pure-to-drain ratio. A built-in UV lamp then kills 99.99% of bacteria, viruses and microorganisms - the one thing a filter cannot catch - operating automatically on water flow pressure. An alkaline and mineral stage finishes the water, putting beneficial minerals back for a balanced pH. Five stages in all - PP, CTO, RO, UV and alkaline - producing up to 400 gallons a day on demand, with no bulky storage tank to hold water, take up space or invite secondary contamination.
One Unit, Installed in San Castle
$995
Installed
Regularly