See the purity, trust the technology. A tankless under-sink system that delivers ultra-pure, clean, refreshing water on demand—perfect for Fort Jefferson in the Dry Tortugas.
The System
The whole system fits under your sink and connects with quick-connect fittings. Four quick-change twist cartridges provide the four filtration stages, with a UV chamber inline. No bulky storage tank—so water is purified on demand, a smart fit for Fort Jefferson’s on-site managed water.
Stage 1 cartridge: catches rust, dirt, sand, and larger particles before they reach the rest of the system.
Carbon block media that reduces chlorine, odors, colors, and chemicals before the membrane—great for managed on-site 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 island living.
Filtration Stages
Each stage handles what the one before it leaves behind. UV is the fourth step in the sequence—and it’s not filtration at all. It’s there to help address what filters can’t catch, which matters in a remote, on-site managed water setting like Fort Jefferson in the Dry Tortugas.
Removes rust, dirt, sand, and large particles—helpful with on-site managed water systems.
Removes chlorine, odors, colors and chemicals.
Removes up to 99% of dissolved solids, heavy metals and more.
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 for disinfection. It’s included in the price on every system we install in Fort Jefferson.
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, with Fort Jefferson’s remote island logistics in mind.
1 UnitInstalled
Regularly $2,000 - you save $1,005
The standard install, and the right fit for a kitchen sink in most homes—including Fort Jefferson kitchens on Garden Key.
2 UnitsInstalled
A lower price per unit when you install two systems at the same time.
Ideal for a kitchen and wet bar, a second kitchen, or a guest suite on Garden Key.
3 or MoreInstalled
Our lowest per-unit price
For larger homes, multi-unit properties, and light commercial needs in the Dry Tortugas area.
All prices are installed and include UV sterilization, with no hidden fees. Not sure how many you need? We’ll walk the property with you on-site in Fort Jefferson.
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.
Typically 95% and up to 99.99%, bringing 200-500 PPM tap water to near 0 PPM, or below 25 PPM.
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—ideal in a tropical maritime climate.
Efficient output: about 1 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—ideal for remote Dry Tortugas living.
One Unit, Installed
$995
Installed
Regularly

Unit, all four cartridges, faucet, fittings & every part needed for island installs.

The built-in UV lamp is included—no add-ons, no upgrades.

Fits neatly under your sink and commissioned by pros—ideal for remote Fort Jefferson setups.

We test your water before and after, so you can see the difference on-site in Fort Jefferson.

No surprises—one low price includes everything.

Lower per-unit pricing when we install two or more—helpful for multi-sink setups on Garden Key.
Independent Testing
You don’t have to take performance on faith. This system has been tested by an independent laboratory against the recognized standard for reverse osmosis drinking water systems—so you can feel confident about what’s coming out of the tap in Fort Jefferson.
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. We test your water during the visit so you know what you’re starting from—especially important with on-site managed water in the Dry Tortugas.
Perfect For
Point-of-use purification—so the water you drink and cook with in Fort Jefferson is the water that gets purified.
Cleaner Water. Better Living. In Fort Jefferson.
Installed with care for Fort Jefferson’s remote, marine environment—and we stand behind the work.
Built with premium materials for reliable, long-term performance—even with marine exposure around Fort Jefferson.
The built-in UV lamp is included in the price on every unit we install in Fort Jefferson.
We stand behind our products and the quality of service we bring to Fort Jefferson.
Join the Fort Jefferson neighbors who choose Mr. Pure Water for cleaner, better-tasting water.
Product Assurances
Better-tasting, odor-free water for drinking, cooking, and everyday use in Fort Jefferson.
Tankless purification as you draw—no storage tank, no waiting, and less worry in marine air.
The built-in UV lamp helps eliminate bacteria, viruses and microorganisms a filter cannot catch.
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 Fort Jefferson’s remote, managed potable-water setups in Dry Tortugas National Park. 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
$995
Installed
Regularly