AQVA AHTI M Reverse Osmosis System – 185L Tank, 50-100 L/h Fresh Water Production from Seawater

User-friendly and expandable reverse osmosis system for purifying drinking and utility water from seawater.

Produces 50-100 liters of clean drinking water per hour, depending on the salt content of the sea area. 

• Delivery/pickup within 1-3 business days from order.
• Order through the online store, via email, or by phone.

Easy to install, start using and operate!

Includes all necessary parts, hoses, and components. The package also includes the required distribution pump from the water tank to consumption, post-filters, and shut-off valves, but the installation and plumbing are not part of the package, as these belong to the property’s water system.

The package includes a lift pump to bring water from the sea to the system and a pressure-boosting pump to raise the input water pressure high enough for salt removal.

Sufficient to easily cover the water consumption of an average nordic family. Easy to use and maintain, even for seasonal use in cottages. With AQVA Baltic (AQ062-B) osmosis membranes, superior salt removal efficiency—up to 97%, even from warm water. With standard AQVA osmosis membranes (AQ062), it is possible to nearly double the fresh water production rate, but the salt removal efficiency will decrease to around 85-90%. In brackish water areas, where the salt content of the sea is lower, the 85-90% salt removal efficiency may still be sufficient.

Also removes other difficult-to-filter compounds, such as uranium, arsenic, blue-green algae (99.9%), fluoride, and chloride. Produces clear, pure, and fresh water. The content of suspended solids and humus in the water source slightly affects filter lifespan, but typically, pre-filters are replaced once a year. Osmosis membranes can last several years, depending on usage and raw water quality.

Includes a two-stage pre-filtration system with AQVA XL-sized filter packages. Produces purified water into the compact, rectangular 185-liter tank included in the system, which acts as a continuous buffer during consumption peaks. (The water reserve can be increased by adding another tank in parallel.) The water level in the tank is controlled by an automatic float valve. When water is used, the water channel opens, and the pressure-boosting pump starts, keeping the tank always full. Indicator lights, a pressure gauge, and water flow meters provide all the essential information about the system’s operation. The most reliable and user-friendly system on the market. Manufactured in Finland.

Water purification capacity at 8 bar input pressure and 5‰ salt content is approximately 50 liters per hour. (Salt content in Finland’s coastal areas typically ranges from 2 to 7‰, depending on location.)

Details of the lift and pressure-boosting pumps

Two-stage pumping. The first pump lifts water from the sea, and the second increases the pressure for reverse osmosis. Voltage: 230 VAC

Nominal current: 4.8 amps @ 8 bar Nominal power requirement: 1.09 kW For the pressure-boosting pump of the reverse osmosis unit, producing 100 liters of pure water from seawater consumes approximately 1 kWh of energy.* *The electricity consumption of the pumps depends on water temperature, salt content, filter usage, and lift height from sea level to the system.

Recommended operating pressure through the pressure-boosting pump is 7-9 bar. The pressure is adjustable from the seawater pump (Scala2) and the flush valve of the osmosis unit. By adjusting the pressure, the desired fresh water production rate is achieved, which is influenced by factors such as salt content, water temperature, and filter usage. With AQVA Baltic (AQ062-B) osmosis membranes, salt removal efficiency is 95-97%. Water temperature, membrane usage, and adjusted input pressure affect the efficiency.

The system includes

• AQVA AHTI reverse osmosis unit (product code: AQRO-AH)
• Osmosis membrane housings and membranes (AQ062-B)
• Seawater intake pump (Scala2)
• Pressure-boosting pump to raise seawater pressure for the system (Scala1)
• XL-sized pre-filtration for suspended solids, odors, and a polyphosphate filter, which extends the life of the osmosis membranes (anti-scalant type)
• 185-liter water tank with necessary penetrations, fittings, and automatic float valve. The estimated capacity during peak consumption, when producing from freshwater with this tank size, is approximately 230 liters per hour (product code: AQ-TAN-185).
• 1-micron replacement air filter for the water tank (product code: AQMF1-M)
• Nearly silent distribution pump from the clean water tank to consumption, Grundfos pressure water automation type (product code: Scala1)
• Post-filtration in the AQVA L-sized housing (product code: AQUF01-L), ensuring hygienic quality of the water taken from the tank
• A neutralization filter package that adjusts the pH value to a suitable level before the water is fed into the distribution network, containing natural calcium (product code: CALBB20)
• Connections for linking the reverse osmosis unit to the pre-filter and water tank

Typical annual operating costs arise from filter replacements. For example, with annual usage of approximately 50,000 liters of water, when producing water from the sea in the outer archipelago, where the typical humus content is COD 10mg/l, typical operating costs are in the range of €200-400. However, it is important to consider the constant quality fluctuations of natural waters, and especially the increase in summer algae growth, which can significantly impact replacement intervals and thus operating costs in either direction. In practice, these details will only become clear after the first few seasons of use.

Filters replaced every two years

• Reverse osmosis membrane x 1, AQ062-B (recommended, may last longer)
• Post-mineralization, CALBB20
• Post-filter, AQUF01-L

Pre-filters replaced once a year

• AQCB-XL (activated carbon, which also filters suspended solids). Depending on the amount of sediment and algae, it may be replaced more frequently.
• AQPF-XL (polyphosphate

Winter Storage

Winter storage of the reverse osmosis system is possible using the valves and shut-offs included with the system. The operating and installation manual describes the process in more detail. In spring, when restarting the reverse osmosis system, follow the instructions for a thorough flush, after which the water can be used normally.

The AHTI-models can also be scaled up to meet larger water production needs. For more information, consult our experts.