Control (saline)Nano Ark
99.989%
E. coli reduction (vs. control)
Fluorescent light 1,350 lux, 24 h | June 2021
Protecting spaces,at the nano scale.
Nano Ark is a photocatalytic nano coating applied by A-ARK in Okinawa. Simply sprayed onto walls, ceilings and air conditioners.
- E. coli (vs. control)
- 99.989% reduction*1
- Mold, 3 species
- Not detected*2
Laboratory results under test conditions
Book a free site survey
Free survey and quote | 2-year warranty | Reply within 24 hours
Independent lab test · E. coli dishes after 24 hours
*1 In a June 2021 test by the Okinawa Environmental Science Center (一般財団法人 沖縄県環境科学センター), E. coli on a dish sprayed with the Nano Ark photocatalyst solution fell to 40 cfu/dish after 24 hours under 1,350-lux fluorescent light — a 99.989% reduction compared with the saline control (3.75×10⁵ cfu/dish).
*2 In a May 2022 test by the same center (report no. 2021-B-02641-01), Penicillium, Cladosporium and Trichoderma were not detected on dishes sprayed with the photocatalyst solution after 72 hours under fluorescent light (control: 6.27×10⁵ / 5.57×10⁴ cfu/dish / too numerous to count).
* Both are laboratory results under test conditions and do not guarantee the same effect in real-world use.
Mold starts
where you can't see.
In Okinawa's heat and humidity, mold comes back even after cleaning.
IllustrativeCeiling cornersCondensation here often leads to black mold.
Around the ACTrapped moisture lets mold grow.
Curtains & fabricsThey soak up humidity.
ClosetsClosed spaces trap moisture.
Behind furnitureStill air and condensation.
- 1Ceiling cornersCondensation here often leads to black mold.
- 2Around the ACTrapped moisture lets mold grow.
- 3Curtains & fabricsThey soak up humidity.
- 4ClosetsClosed spaces trap moisture.
- 5Behind furnitureStill air and condensation.
For places with little light, we advise during the site survey. Photo is illustrative.
Cleaning alone can't reach everywhere.
See the solutionJust spray it on.
An invisible nano coating for walls, ceilings and furniture.
Illustrative
Illustrative
Illustrative
*1 The E. coli test was run by an independent lab under fluorescent light (1,350 lux), not UV lamps. Results vary with lighting and the installation environment. Footage is illustrative; particle and bacteria sizes and shapes are not to scale.
Clean is the first thing
your guests notice.
Right down to the details.
See the numbers.
Tests by the Okinawa Environmental Science Center (一般財団法人 沖縄県環境科学センター) confirmed an E. coli reduction and no detectable mold (3 species) under fluorescent light.
Nano ArkControl (PBS)
0
All 3 mold species not detected
Penicillium, Cladosporium, Trichoderma | Fluorescent light, 72 h | May 2022
Testing laboratory: Okinawa Environmental Science Center
* Laboratory results under test conditions. Results may differ in real installations; the effect is not guaranteed.
* The center performed the tests; it does not certify or endorse products.
* The colony-growth motion shown as the dish photos appear is an illustrative effect made from the actual test photos. The still image it ends on is the actual test photo.
Reference: our in-house comparison
6 / 1,410ATP reading after 3 hours (Nano Ark / competing product, RLU)
We compared Nano Ark with a competing product using ATP swab testing. ATP readings indicate the amount of organic contamination, including bacteria.
* An in-house reference test by A-ARK, separate from the Okinawa Environmental Science Center tests.
* The competing product is not named for confidentiality reasons. Values are readings at each time point; results vary with conditions. No starting value is recorded for the competing product, so its line starts at 1 hour.
* Starting conditions could not be confirmed as identical, so this does not show that either product is better.
Built for buildings
with many rooms.
About 20 minutes per room, keeping downtime short.
- Hotels & resorts
- Care homes
- Clinics
- Restaurants & shops
- Rentals & apartments
- Homes
- Vehicles
Illustrative image
Contact us
We reply within 24 hours.
Free site survey
We check the areas and floor space, then quote.
Application
No masking. About 20 minutes per room.
Back in use once dry
Use the room as usual once the surface is dry.
On the job
Real job photos retouched with AI (edited so no face is shown).
Priced by
floor area.
Walls and ceilings are included in the floor-area price (walls over 3 m are quoted separately).
- 2-year application warrantyIf mold or odor returns in a treated area within 2 years, we re-apply free of charge.
- Free site survey and quoteNo cost if you decide not to go ahead.
- Walls and ceilings includedWalls over 3 m high are quoted separately.
- Remote consultation availableSend photos or floor plans for an estimate.
- Support after applicationIf anything concerns you, just get in touch.
Nano Ark FAQ
How long is a room out of use?
Application takes about 20 minutes per room (depending on size and furniture). No masking is needed, and the room can be used as usual once the surface is dry.
Does it work in dark places?
We have no test data for use without light; both independent lab tests were run under fluorescent light. For rooms with little lighting or no windows, we assess the conditions during the site survey and advise you.
How long does it last?
We have no durability test data, and duration also depends on sunlight, humidity and cleaning. Instead, every job comes with a 2-year application warranty: if mold or odor returns in a treated area within 2 years, we re-apply free of charge.
Can it be used where people and pets live?
We explain the ingredients and any precautions during and after application at the site survey. Feel free to ask.
Start with a free
site survey.
- Free site survey and quote
- No cost if you decide not to go ahead
- We reply within 24 hours
- 2-year warranty (free re-application if mold or odor returns)
- Phone
- +81 70-2828-4356 (Japanese)
- [email protected]
- Service area
- Okinawa Prefecture
Contact form
Takes about a minute.