Questions about drinking water produced on site.
Direct answers on the Air and Pure systems, water quality, installation, service and coverage in Thailand. Each answer links to the page that covers it in detail.
Systems and output.
How the Air and Pure ranges produce water, how much and at what temperature.
How does an atmospheric water generator make drinking water?
An atmospheric water generator makes drinking water by condensing the humidity in the air and treating it on site. A Minairal Air system pulls humid air through a filter, condenses it, protects the water with filtration and UV, then remineralises it with calcium, magnesium, potassium and sodium. On the Air Stand Pro the sequence has seven stages: air filter, sediment, pre-carbon, reverse osmosis, post-carbon, LED UV and a UV lamp in the tank.
How much water does an air-to-water machine produce per day?
A Minairal air-to-water machine produces 13 to 30 litres a day on average, depending on the model. The Air Top produces 13 L a day on average, the Air Stand 16 L and the Air Stand Pro 30 L. These are average daily outputs, for relative humidity between 30% and 80% and an average temperature of 25°C.
Does an air-to-water system work when humidity is low?
Yes. The systems work between 30% and 80% relative humidity. Rated outputs, 13, 16 and 30 litres a day depending on the model, are averages for that humidity range at an average temperature of 25°C. Whether the climate and the daily volume on your site suit an Air system is checked at the site assessment, before any commitment.
Does an air-to-water system need a water connection or plumbing?
No. An Air system plugs in and needs no plumbing and no connection to the water network. It makes its water from the humidity in the air, so the supply exists whether the mains does or not. This makes it a fit for sites where the water line is absent or unreliable, or where island and coastal networks lose pressure at peak demand.
What temperatures does the water come out at?
Pure systems deliver hot water at 90°C and cold water at 4°C. In the Air range, the Air Top and the Air Stand deliver hot and cold water, while the Air Stand Pro delivers cold water only. Where a point of use needs hot water, the model is chosen accordingly at the site assessment.
Air or Pure: which system should my site choose?
The choice depends on the site and is made at the site assessment, on four questions. Does a water connection exist, and how reliable is it? How many litres a day are needed, and at which points? Is the space countertop, floor or several points of use? Must water keep flowing when the network does not? Air needs no water connection, so its supply is independent of the network. Pure gives a stable output from your existing line.
Water quality.
What the systems remove, what they restore and how the result is checked.
Which minerals are added back to the water?
Four minerals are restored after filtration: calcium, magnesium, potassium and sodium. Reverse osmosis removes heavy metals and dissolved contaminants, so a mineral filter puts these four back after it. The mineral stage uses Biocera technology from Korea, and its cartridge is replaced every twelve months. Both the Air and Pure ranges end with the same remineralisation, at an alkaline pH.
What is the pH and TDS of the water?
Water from Minairal systems has a pH of 8.5 or above, which is alkaline, and total dissolved solids (TDS) of 40 to 80 ppm. These values come from the remineralisation stage, which restores calcium, magnesium, potassium and sodium after reverse osmosis at 0.0001 micron. TDS and pH are checked by our technicians during routine maintenance visits.
How is water quality verified?
Water quality is verified in two ways. Under our business service plan, water produced on site can be tested once a year by an independent laboratory accredited to ISO 17025. Between tests, TDS and pH are checked during routine maintenance. Components are certified for material safety, and the reverse osmosis membrane is rated at 0.0001 micron. Once a system runs, the laboratory report for your site is available on request.
Is tap water safe to drink in Koh Samui and Thailand?
Mains water in Thailand is not intended to be drunk at the tap. Depending on province and season it can carry chlorine and its by-products, sediment, heavy metals, and bacteriological risk wherever the network is old or intermittent. Island and coastal networks, such as those on Koh Samui, add salinity and pressure loss at peak demand. Bottled water moves the problem rather than solving it, since its quality depends on the bottler and on storage.
What does reverse osmosis remove?
Reverse osmosis removes heavy metals and dissolved contaminants by filtering water through a membrane rated at 0.0001 micron. Before it, a sediment pre-filter reduces sand, rust, dirt and chlorine taste and protects the stages downstream. After it, a post-carbon stage improves taste and smell, and the mineral filter restores calcium, magnesium, potassium and sodium. On Pure systems the membrane is rated at 75 GPD, roughly 12 litres an hour.
How often are the filters replaced?
The sediment pre-filter is replaced every 6 months on Air systems and every 4 months on Pure systems, as part of planned maintenance. The reverse osmosis membrane, the post-carbon filter and the mineral filter are replaced every 12 months. Filter replacement, preventive checks and cleaning are carried out on schedule by our technicians.
Installation and service.
From the site assessment to maintenance, with the same team and the same agreement.
What happens at a site assessment?
At a site assessment, we evaluate the space, the number of users and the points of use before recommending anything. We also look at whether a water connection exists and how reliable it is, the daily volume needed and whether water must keep flowing when the network does not. You then receive a configuration, a capacity and a maintenance plan, written for your site, before any commitment.
How long does installation take?
A Pure system is installed in under an hour on an existing water line. An Air system needs no plumbing: it is placed and plugged in. In both cases, machines are checked and configured before delivery, then placed, connected and tested on site. Your team is then trained on the machines actually installed, with manuals and quick-start guides.
Who maintains the systems, and how fast do you respond?
Minairal maintains the systems it installs, with technicians on its own payroll, two to five per service centre. Response is the same day in most cases and 48 hours at the latest, Monday to Saturday, with a named local contact and support in English and Thai. Planned care covers preventive checks, filter replacement and cleaning on schedule, and several hundred spare parts are held in Thailand.
What is included at handover?
Every installation ends with a signed report. Position, connection, scope and condition are recorded and signed by both parties at handover. Your team is then trained on the machines actually installed, with manuals and quick-start guides. From then on, one agreement covers maintenance and parts for the whole life of the system, with the pre-filter replaced every four to six months and the other cartridges every twelve months.
Can we see the systems before deciding?
Yes. The head office in Bo Phut, Koh Samui, includes a showroom where Minairal systems can be seen. The address is 138/42 Moo 2, Tambon Bo Phut, Koh Samui, Surat Thani 84320, and the team works Monday to Saturday. For sites in Phuket, Hua Hin, Bangkok or Koh Phangan, the site assessment is the moment to review the models that fit your space.
Sustainability and costs.
What a site stops buying, shipping and handling once water is produced where it is drunk.
How many plastic bottles does a site stop buying?
One person drinking two litres a day from half-litre bottles uses 1,460 bottles a year. A site of fifty people therefore stops buying 73,000 bottles a year, with 730 litres per person produced on site instead. Change the bottle format or the daily volume and the figures change. The impact calculator applies the same assumption to your own headcount, bottle or gallon format and number of years.
Beyond plastic, what costs does an on-site system remove?
An on-site system removes the costs that come with bottled water, not only the plastic. That means bottling, boat and truck freight to an island, refrigeration on the way and disposal afterwards. On site, it also removes bottle storage, delivery coordination and stock-outs. The system itself is built to be repaired: it is serviced and refurbished rather than discarded, filter cartridges are replaced on schedule rather than the unit, and spare parts are held in Thailand.
Does an on-site system remove water deliveries?
Yes. An Air system takes water delivery off the site entirely, because it produces its water from the air: zero deliveries. A Pure system draws from your existing water line, so bottle and gallon deliveries stop as well. On an island, where every litre of bottled water arrives by boat and then truck, removing that freight is the largest effect.
Can the glass bottles carry our hotel's logo?
Yes. An optional 500 mL reusable glass bottle is available for guest-facing service, and it can carry your logo alongside ours. The mineral composition is printed on the label. The bottle replaces single-use plastic on the table, in the room or at the desk, in hotels, resorts, restaurants and offices.
Company and coverage.
Who installs the systems, and where.
Who is Minairal?
Minairal, legally MINAIRAL CO., LTD., is a Thai company that designs, installs and services mineral drinking water systems, produced either from ambient air or from an existing water line. It was incorporated in 2024, is registered with the DBD under number 0845567012457 and has its head office in Bo Phut, Koh Samui. Its founder and CEO is Nicolas Guy. The team counts 13 people, eight of them in installation and maintenance, and has installed over 700 systems.
Which areas of Thailand do you cover?
Minairal covers four provinces from three service centres: Koh Samui (head office, Bo Phut), Phuket (Chalong) and Hua Hin (Hin Lek Fai). Each centre holds parts in stock and runs two to five technicians. Bangkok is served from our network, and Koh Phangan from Koh Samui. Installations include hotels and resorts, restaurants, wellness centres, villas and schools.
Do you supply systems for homes?
Yes, through a separate online shop. This site covers business installations, from hotels and restaurants to offices, schools, clinics and villas, sized at a site assessment. Air-to-water machines and water filters for residential use are sold on the Minairal online shop, which also answers questions specific to home systems.
For your home: questions on residential systems are answered in the online shop FAQ.
A question not answered here?
Tell us the site, the number of people and the points of use. The team that installs the system answers, and comes back with a configuration, a capacity and a maintenance plan.