What Sotralentz does

Sotralentz Sp. z o.o. is a Polish plastics and water-management company that has operated as GRAF Polska Sp. z o.o. since being acquired by Germany's Otto Graf GmbH (GRAF Group) in August 2017. Headquartered at ul. Unii Europejskiej 26 in Skierniewice, the entity functions as the Polish arm of GRAF Group, which manufactures its products in Teningen, Germany and distributes them across at least 14 countries.

Its core offering is a portfolio of plastic tank systems and complementary modules for rainwater harvesting, stormwater infiltration and retention, biological wastewater treatment, fat and petroleum separation, and firefighting/heating-oil storage. The flagship platforms are the Carat, Cristall, Platin, and Herkules underground tank families, ranging from 1,500L flat Platin units up to 65,000L and Carat XXL configurations for industrial and stadium-scale deployments. Wastewater treatment is built around SBR (Sequential Biological Reactor) technology — branded as one2clean, actibio, actibioXL, easybio, and bio-max — which the company cites as achieving up to 98% purification efficiency. Supporting modules include Universal Filter 3 (and XL), Optimax-Pro, and Minimax-Pro internal filters, Aqua-Center pump control units (Basic, Silentio, Silentio Press, Silentio Connect), and the EcoBloc Inspect modular stormwater management system. Tanks are warranted for up to 30 years and are produced using recycled plastics sourced from the parent's own raw material centers.

The business model is hardware sales of these systems, priced on a quote basis through regional technical-commercial representatives and country-specific websites, with no publicly disclosed pricing. GTM is direct, combining a regional field-sales force, country subsidiary offices, e-commerce-style product advisors on the corporate site, downloadable catalogs, GRAF Academy webinars, and GRAF TV video content. The customer base is horizontally diversified across Residential Homeowners (primary), Commercial & Industrial, and Municipalities, with named enterprise deployments spanning food retail (Edeka Offenburg, KFC Nowy Dwór Mazowiecki), sports stadiums (Carl-Benz-Stadion Mannheim, LASK Raiffeisen Arena Linz), horticulture (Gärtnerei Erfurt), industrial (Siemens Testzentrum Ludwigsfelde), hospitality (SNØ Skihalle Oslo), retail (toom Baumarkt Hof), and zoos (Zoo Münster). Revenue and headcount figures for the Polish entity are not disclosed; firmographic data indicates 19 employees at the Sotralentz/GRAF Polska level.

Name

Sotralentz

Legal name

GRAF Polska Sp. z o. o.

Website

https://sotralentz.pl

Company type

Private

Operating status

Acquired

Headcount range

11–50 employees

Short description

Sotralentz, now operating as GRAF Polska Sp. z o.o. since its August 2017 acquisition by Germany's Otto Graf GmbH, is the Polish subsidiary of GRAF Group. It distributes plastic rainwater harvesting tanks, biological wastewater treatment systems, and stormwater management modules manufactured in Germany to residential, commercial, and municipal customers.

Ownership category

akta.pro rank

Product category

Water Management Equipment

NAICS

Water Supply and Irrigation Systems (22131), Sewage Treatment Facilities (221320), Water and Sewer Line and Related Structures Construction (23711)

SIC

Water Supply (4941), Pumps & Pumping Equipment (3561), Water, Sewer, Pipeline, Comm & Power Line Construction (1623)

akta.pro primary industry

Water Storage & Delivery Infrastructure (Tanks, Reservoir Liners, Bladders) (AFABAHAK)

akta.pro secondary industries

Water & Wastewater Treatment Plant Equipment (Clarifiers, Aeration, Membrane Systems) (IMAHAEAJ), Stormwater Quality Treatment & BMPs (Hydrodynamic Separators, Filters, Oil-Grit) (EUANAEAF), Gutters, Downspouts & Rainwater Systems (IMADAFAM)

Keywords

• Rainwater harvesting systems
• Wastewater treatment plants
• Plastic tank manufacturing
• Stormwater management solutions
• Water management equipment

Headquarters

HQ city

Skierniewice

HQ country

Poland

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

Supply Chain, Operations, Technology or R&D, Personnel, Marketing or Sales

Revenue model

1. Plastic Tank and Water Management Product Sales: Sale of underground and above-ground plastic tanks for rainwater harvesting, wastewater treatment systems, separators, oil tanks, and firefighting water reservoirs. Products include the Carat, Cristall, Platin, and Herkules tank lines along with associated filtration and pumping systems.
2. Complete Sewage Treatment Systems: Full biological sewage treatment plants including SBR technology systems (one2clean, actibio, actibioXL, easybio, bio-max), drainage systems, and tunnel systems for domestic wastewater treatment

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Sotralentz (now operating as GRAF Polska Sp. z o.o. since August 2017) manufactures and sells plastic tank systems for rainwater harvesting, wastewater treatment, stormwater management, and water storage. Core offerings include underground rainwater tanks (Carat, Cristall, Platin, Herkules series), SBR biological wastewater treatment plants (one2clean, actibio, actibioXL, easybio, bio-max), fat and petroleum separators, oil storage tanks, EcoBloc Inspect stormwater infiltration/retention systems, decorative above-ground rainwater tanks, and firefighting water reservoirs.

Product overview

GRAF (parent company of former Sotralentz, now operating as GRAF Polska Sp. z o.o. since August 2017) offers a comprehensive water management solutions portfolio. The product ecosystem centers on underground rainwater harvesting tanks (Carat, Cristall, Platin, Herkules series) as the core platform, complemented by extensive add-on modules including various filter systems (Universal Filter 3/3 XL, Optimax-Pro, Minimax-Pro), pump control units (Aqua-Center Basic, Silentio, Silentio Press, Silentio Connect), and infiltration solutions (EcoBloc Inspect system, infiltration tunnels and chambers). The wastewater treatment segment includes SBR technology-based biological treatment plants (one2clean, actibio, actibioXL, easybio, bio-max) for residential and commercial applications. Additional product lines cover separator systems (Saphir and Diamant fat/oil separators), heating oil tanks (single and double-wall), and firefighting water tanks (Carat XXL-based). Products are designed for residential, commercial, and municipal use with up to 30-year warranties, manufactured in Germany with recycled plastic materials.

Differentiator

Problem solved

Functional benefit

Quantifiable outcome

• Up to 50% drinking water savings through rainwater utilization
• +2 more outcomes

Named customers9 records

Segments3 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature5 records

Scale indicators2 records

Recent moves5 records

Expansion highlights5 records

Direct peers

• Rehau Group: Manufacturer of polymer-based building solutions including stormwater management, rainwater systems, and decentralized wastewater treatment — comparable on plastic tank and stormwater infrastructure categories.
• Roth Werke (Roth Plastic Technology): German plastic tank manufacturer offering rainwater harvesting tanks, oil/heating-oil storage, and wastewater systems — directly comparable product portfolio and target customer base.
• ACO GmbH: German manufacturer of drainage, stormwater management, and decentralized wastewater treatment systems; competes head-to-head with GRAF in EcoBloc stormwater modules and separator/oil-separator categories across Europe.
• Zelena Infra (Polder / Wavin): Wavin offers plastic stormwater infiltration/retention crates and rainwater management solutions competing with GRAF EcoBloc across European municipal and commercial projects.
• Premier Tech Water and Environment: Manufacturer of decentralized wastewater treatment plants (Ecoflex, Biofilter) and stormwater management modules — directly comparable on residential and small-municipal wastewater treatment technologies.
• GRAF Group (Otto Graf GmbH): Parent company of GRAF Polska and the originator of the same Carat, Platin, Cristall, EcoBloc and SBR product lines sold through the Polish entity — directly comparable on product, technology, and customer base.

Broad incumbents

• Kingspan Water & Energy: Large building solutions group with a rainwater harvesting and stormwater management portfolio including plastic and steel tanks; broader incumbent with global reach and adjacent building-products portfolio.
• Wilo SE: Major pump and pumping-systems manufacturer whose Aqua-Center-type pump controls and rainwater pumps are used in GRAF systems; broad incumbent in building water and HVAC pumping.
• Uponor Corporation: Building water infrastructure company offering rainwater management, stormwater solutions, and decentralized wastewater; broader incumbent in plastic piping and building water systems across Europe.

Regional players

• Frank GmbH: German manufacturer of plastic rainwater harvesting tanks, retention/infiltration systems, and wastewater treatment; primarily serves German-speaking markets with comparable products to GRAF's core lines.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks6 records

Key highlights6 records

Customer concentration

• LinkedInlinkedin.com/company/sotralentz

Revenue estimate

Valuation estimate

Number of profiles

Funding overview

Funding rounds

Investors

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Sotralentz