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About Us

StrongFlow is an expert organisation specialised in water treatment and automation systems and products. We do not just spend time in the office but focus on designing and delivering physical products and solutions.

Our premises are in Ahokylänkatu 3, Kaarina, Finland, where we have around 400 m² of production and office space.

In addition, our group includes the water treatment company Callefiks OÜ located in Artelli 19, Tallinn, Estonia.

Three Things That Make Us Different

In-house design and manufacturing

We are not wholesalers. Our goal is to design and manufacture every product and system in-house whenever it is possible and reasonable to do so. This means that we design all systems according to you, the customer’s requirements, select the best components for every case and manufacture the equipment from beginning to end – from machine skid welding and e-cabinet piercing to system electrification and final assembly, commissioning and maintenance.

Water treatment and automation experts under one roof

Because we work in the water treatment and automation segments (jointly and separately), we are able to employ top-level experts from both disciplines. This enables us to create your tailor-made solutions efficiently. Due to this combined expertise, we can also use the latest digital technologies in our systems.

Local and global

We are proud of working and providing employment opportunities locally. On the other hand, if you need a reverse osmosis system with installation in Ulan Bator or an automation system in Valparaíso, we can do it. Over the years, we have delivered water treatment systems to Brazil, undertaken the maintenance of submarines in South Korea and sailed around the high seas repairing ships.

Milestones from Our History

  • 1996: Mr. Heikki Lehtinen established a one-man electrical and automation company.
  • 2006: The company changed to a limited company and was named Sähköautomaatio Lehtinen Oy.
  • 2015: Aqua Gravia Oy is merged into the company – expansion into water treatment.
  • 2018: The company gets a new name – StrongFlow Oy.
  • 2019: StrongFlow acquires a majority of the Estonian water treatment company Callefiks.

Our Customers

Our customers include industrial companies, equipment manufacturers, engineering workshops, ports, shipyards and shipowners.

StrongFlow is a Schneider Alliance Partner
StrongFlow is a member of the Finnish Water Forum