Calmag

What Calmag does

Calmag is a UK-based water treatment solutions brand operating as a trading division of Monarch Water Ltd, a private limited company registered in England and Wales (Company No. 06590010), with a registered office in Reading and correspondence address in Diss, Norfolk. The company sells a comprehensive portfolio of water treatment hardware across two segments: domestic products for homeowners and commercial products for businesses requiring industrial-scale water treatment. Core offerings include scale inhibitors, central heating chemicals, power flushing products, condensate neutralisers, ultraviolet (UV) disinfection systems, water filters, central heating filters, and CALRO reverse osmosis systems. All products carry WRAS certification for UK water regulation compliance, and the company holds affiliations with the Institute of Plumbing and Heating Engineering (IPHE) and has been featured in the Parliamentary Review.

The underlying technology relies on established water treatment mechanisms — physical and chemical scale inhibition, membrane-based reverse osmosis filtration, UV-C disinfection, chemical neutralisation of acidic condensate, and mechanical filtration for central heating system debris. A dedicated sub-brand, Monarch Professional, addresses commercial-grade installations through a separate domain (monarchwaterprofessional.co.uk). Calmag also offers central heating chemicals and power flushing products as consumables that complement the installed hardware base.

The business model is primarily hardware sales with a supporting professional services layer. Domestically, Calmag operates through a B2B2C distribution network of merchants and local plumbing installers; commercially, the company sells directly to enterprise customers. Service and repair bookings are facilitated through a partner e-commerce platform (monarchwatershop.co.uk). Pricing is not publicly disclosed and is contact-based via the sales team. No headcount, revenue, funding, or investor data is publicly available, and the company operates exclusively in the UK market with no disclosed international expansion.

Name

Calmag

Legal name

Calmag

Website

https://calmagltd.com

Company type

Private

Founded year

2002

Operating status

Operating

Headcount range

11–50 employees

Short description

Calmag is a UK-based water treatment hardware brand under Monarch Water Ltd, selling scale inhibitors, reverse osmosis, UV disinfection, and central heating products to homeowners, commercial customers, and plumbing installers via merchant distribution and direct sales.

Ownership category

akta.pro rank

Product category

Water Treatment Equipment

NAICS

Soap, Cleaning Compound, and Toilet Preparation Manufacturing (3256), Soap and Cleaning Compound Manufacturing (32561)

SIC

Soap, Detergents, Cleang Preparations, Perfumes, Cosmetics (2840), Specialty Cleaning, Polishing And Sanitation Preparations (2842)

akta.pro primary industry

Whole-House (Point-of-Entry) Water Treatment Systems (CRAJAJAE)

akta.pro secondary industries

Water & Home System Care (Water Softeners, Septic Treatments, Drain/Openers, Appliance Cleaners) (CRADAKAK), Softening & Demineralization (Lime Softening, Ion Exchange) (EUANABAE), Water Filtration, Treatment & Softening Plumbing Products (IMADALAK), Water Softener, Filtration & Treatment System Installation (HSAOAAAH)

Keywords

• Water treatment solutions
• Scale prevention systems
• Water filtration products
• Central heating protection
• Reverse osmosis systems

Headquarters

HQ city

Keighley

HQ country

United Kingdom

HQ region

Europe

Offices2 records

Markets served

GTM type

B2B and B2C

Offering type

Hardware or Manufacturing

Cost components

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

Revenue model

1. Water Treatment Hardware Sales: Sale of physical water treatment products including scale inhibitors, water filters, reverse osmosis systems, UV disinfection units, condensate neutralisers, and central heating filters for both domestic and commercial markets
2. Professional Services: Installation, servicing, and repair services for water treatment products

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

Calmag manufactures and sells physical water treatment hardware products for UK homes and businesses, including scale inhibitors, water filters, central heating filters and chemicals, power flushing products, condensate neutralisers, ultraviolet disinfection units, and reverse osmosis systems. The company operates separate domestic and commercial product lines distributed through a merchant and plumbing installer network, with installation, servicing, and repair offered as professional services alongside product sales.

Product overview

Calmag offers a comprehensive portfolio of water treatment solutions for both domestic and commercial applications. The product lineup centers around scale prevention technologies including Scale Inhibitors and Water Conditioners, complemented by a full range of complementary products: CALRO Reverse Osmosis Systems, UltraViolet Disinfection units, Water Filters, Central Heating Filters, Condensate Neutralisers, Central Heating Chemicals, and Power Flushing Products. The company operates under two main segments—Domestic products and Commercial products—with the Monarch Professional sub-brand serving professional/commercial installations. The offerings form an integrated ecosystem addressing water hardness, disinfection, filtration, and system maintenance needs.

Differentiator

Problem solved

Functional benefit

Products and services

• Scale Inhibitors Water treatment devices that prevent limescale buildup in pipes and appliances by conditioning the water supply, available in domestic and commercial variants for homeowners and businesses.
• Central Heating Chemicals Chemical treatments for maintaining and protecting central heating systems from corrosion and scale, sold to installers and homeowners for use in residential central heating.
• Power Flushing Products Products for power flushing central heating systems to remove sludge, scale, and debris buildup, used by installers during heating system cleans.
• Condensate Neutralisers Devices that neutralise acidic condensate from condensing boilers, available in domestic and commercial variants for residential and business heating installations.
• UltraViolet Disinfection Systems UV water treatment systems for disinfection of water supplies, available in domestic and commercial variants for household and business water safety applications.
• Water Filters Range Filtration products designed to remove impurities and improve water quality in residential and small commercial settings.
• Central Heating Filters Filters installed in central heating systems to capture debris and protect boilers and heating components from contaminants.
• CALRO Reverse Osmosis Systems Reverse osmosis water treatment systems providing high-purity water through membrane filtration technology, available for domestic and commercial use where high-purity water is required.
• Monarch Professional Commercial-grade water treatment solutions sub-brand for professional installations, targeting plumbing and heating installers specifying commercial and larger-scale systems.
• Commercial Water Conditioners Commercial water conditioning products that prevent scale buildup and protect commercial equipment, positioned for businesses requiring larger-scale scale prevention than domestic units.

Quantifiable outcome

• Recommended for water with 100ppm or above hardness levels

Named customers3 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

Feature6 records

Partnerships

One partnership is on record.

• Monarch WatercoreStrategic or Co-development PartnerCalmag is a brand operating under Monarch Water Ltd. Monarch Water is the parent company providing the overarching brand, registered office (Reading), correspondence address (Diss, Norfolk), and operational infrastructure. Calmag serves as the consumer-facing brand for domestic and commercial water treatment products.

Scale indicators1 record

Recent moves5 records

Expansion highlights3 records

Direct peers

• EcoWater Systems UK: UK distributor of EcoWater branded water softeners and treatment systems, selling through dealer networks to homeowners. Comparable on domestic hard-water treatment focus, specification-led messaging, and installer-driven distribution.
• Fernox: UK leader in central heating chemicals, inhibitors, filters, and power flushing products sold through plumbing merchants. Most directly comparable to Calmag's Central Heating Chemicals, Power Flushing, and Central Heating Filters lines, with stronger trade brand recognition.
• Harvey Water Softeners: UK-focused water softener and water treatment specialist selling through a similar merchant and installer network to homeowners. Closest direct competitor in domestic hard-water treatment with comparable product positioning and channel strategy.
• Brita (UK): UK arm of a global water filtration brand offering jug filters, tap filters, and point-of-use systems. Comparable on water filtration and quality solutions for consumers, with stronger brand recognition but a narrower product range (no scale prevention or heating protection).
• Kinetico UK: UK division of a global water treatment specialist offering water softeners, filtration, and reverse osmosis to domestic and commercial customers. Directly comparable on product range, specification-led positioning, and reliance on UK dealer and installer networks.

Emerging players

• Water2Buy: UK-based online-first water softener and water treatment retailer targeting homeowners directly. Comparable on domestic hard-water treatment products, with a different (direct-to-consumer online) channel strategy that competes for the same end customer.

Broad incumbents

• Culligan UK: Established UK arm of a global water treatment company offering softeners, filtration, and commercial water solutions with a larger scale and broader portfolio. Comparable on commercial segment coverage and brand recognition, with deeper enterprise reach.
• Monarch Water: Parent company and broader water treatment brand operating over Calmag's portfolio and shared UK plumbing distribution. Comparable product categories (softeners, filters, RO, commercial) and customer base, with a wider brand and direct salesforce representation.
• BWT (Best Water Technology) UK: European water technology leader with UK operations covering domestic softeners, point-of-use filters, and commercial water treatment. Overlaps with Calmag's domestic and commercial hard-water and filtration propositions, with a stronger international brand presence.

Regional players

• Viessmann (UK): UK operation of a major European heating and water systems manufacturer whose product set intersects with Calmag's condensate neutralisers and central heating chemicals. Comparable on heating-side water treatment and installer network distribution, but with a broader heating-systems portfolio.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights6 records

Customer concentration

• Facebookfacebook.com/100067455720692
• LinkedInlinkedin.com/company/calmagltd
• Xx.com/calmagltd

Compliance1 record

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 Calmag