Water Treatment

The CalMag 15mm Compression Magnetic Scale Inhibitor is designed to help prevent limescale build-up throughout the home. This maintenance-free magnetic scale inhibitor provides whole-house protection without chemicals or additives.

WRAS approved and supplied with 15mm compression fittings, it is suitable for cold water lines and offers a simple solution for helping protect household plumbing from limescale.

Delivery: Tracked 48 £2.99 (2–3 working days) or Tracked 24 £4.00 (1–2 working days). Free collection from our Wellingborough branch.

Fernox Cleaner F3 is a universal, pH-neutral central heating system cleaner designed to remove sludge, limescale and other debris from domestic heating systems.

It is suitable for both new and existing central heating systems and can be used as part of a system clean or prior to installing a new boiler. F3 is non-foaming and compatible with all common heating system materials, including aluminium.

One 500ml bottle treats up to 130 litres of system water, equivalent to approximately 16 radiators or 250m² of underfloor heating.

Fernox Leak Sealer F4 is an internal leak sealer designed for use in central heating systems to seal small, inaccessible leaks and weeps that can cause pressure loss and boiler breakdowns.

Once added to the heating system, F4 circulates through the system and seeks out areas where oxygen is entering through microscopic leaks. It then forms a polymer seal around the affected area, helping to stop the leak without the need to drain down the entire system.

Fernox F4 is effective within 1 to 24 hours and is designed to remain permanently in the system. It is compatible with all common heating system metals and materials, including aluminium, and is formulated not to cause blockages or restrictions in vulnerable components such as pumps, air vents and heat exchangers.

One 500ml bottle treats up to 130 litres of system water, equivalent to up to 16 radiators or 250m² of underfloor heating.

Fernox Protector F1 500ml is a high-performance central heating inhibitor designed to provide long-term protection against corrosion and limescale formation in domestic heating systems.

It combines multiple corrosion and scale inhibitors to protect the metals within the heating system and help prevent the formation of damaging sludge and deposits. Enhanced pH buffering helps maintain system water between pH 6.5 and 8.5, the optimum range for protecting mixed-metal heating systems.

One 500ml bottle treats a heating system of up to 130 litres, 16 radiators or 250m² of underfloor heating. Protector F1 is suitable for all types of boilers, radiators and pipework systems and is compatible with commonly used heating system materials, including aluminium.

For best results, contaminated systems should be cleaned and flushed before adding Protector F1. Fernox recommends checking inhibitor concentration annually as part of routine boiler or heating system servicing.

The Fernox TF1 Omega Installer Pack 22mm With Valves is a complete solution for cleaning, protecting and guarding domestic central heating systems.

The pack combines the Fernox TF1 Omega 22mm Filter with valves, Fernox Cleaner F3 500ml and Fernox Protector F1 500ml, giving installers the key products needed to clean an existing system and provide long-term protection against corrosion and limescale.

The TF1 Omega is a precision-engineered, sealed in-line system filter made from nickel-plated forged brass. It combines a powerful neodymium magnet with Hydronic Particle Separation technology to capture both magnetic and non-magnetic contaminants from central heating system water.

The filter is designed to minimise pressure loss while maintaining high collection efficiency. It can be cleaned without dismantling the filter, with collected debris discharged through the drain valve. Fernox recommends installing it on the return pipe to the boiler.

The pack is backed by a 25-year warranty on the TF1 Omega filter.

Enhance your plumbing system's efficiency with the CalMag Magnetic HF1 Filter Pack. This pack includes a scale inhibitor and sludge flux remover, effectively improving water quality and prolonging appliance lifespan.

The Worcester Greenstar 22 mm System Filter 7733600236 is a powerful magnetic and non‑magnetic filter that removes rust, metal filings, solder fragments and other debris from your central heating water — helping prevent boiler and pump issues. It is easy to install under, over or remotely from the boiler and includes isolation valves, a detachable body for easy servicing and a drainage point for maintenance. With up to 300 g of magnetic debris captured, this filter helps prolong boiler life and maintain heating efficiency.

Worcester Greenstar Brass System Filter 22mm

The Worcester Greenstar Mini System Filter 22mm (7733600266) provides compact, high-performance protection for your heating system by capturing magnetite and debris before they enter the boiler. Designed for maximum efficiency and easy installation, it helps improve system reliability, prolong boiler lifespan, and reduce maintenance costs—ideal for modern Worcester Bosch heating setups.

Revitalise your central heating system with CalMag Fortis Chemical Plumbco Powerflush Descaler Red. This 1L descaling solution is specifically designed to remove limescale, rust, and other deposits from your heating system. It effectively cleans and restores system efficiency, improving heat transfer and preventing further corrosion and blockages. Suitable for all types of systems, including open vented, sealed, and combination boilers, CalMag Fortis Chemical Plumbco Powerflush Descaler Red is easy to use and provides exceptional results. Keep your heating system running smoothly and efficiently with this powerful descaler. Shop now at Plumbco Online and enjoy reliable heating performance.

The BiWorld Smart Mag Compact Filter Chemical Pack is a complete solution for protecting your central heating system from sludge, scale and corrosion. The filter uses powerful magnets to trap ferrous debris, such as magnetite, which can cause blockages and reduce the efficiency of your system. The chemical pack contains two products: B3 Cleanser, which removes existing sludge and scale, and B1 Protector, which prevents further build-up.

The filter is easy to install and maintain. It can be fitted on either the flow or return pipework and has a built-in isolation valve for easy servicing. The chemical pack is also easy to use, simply add the required amount to your system and circulate for the recommended time period.

CT1 MultiSolve Cleaner & Degreaser effectively removes adhesives, sealants, wax, paraffin, printing ink, oil, grease, and silicone. Ideal for DIY, construction, and professional use, it makes surface preparation quick, safe, and hassle-free.

The Sentinel 22mm Electrolytic Scale Inhibitor (SESI22) protects domestic heating systems from limescale and corrosion. Easy to install on pipework, it helps maintain boiler efficiency, prolong system life, and reduce energy costs by preventing scale buildup in water pipes and central heating systems.

The Viva 1¼″ Magna Self‑Sealing Waste Valve (product code WTSTC32) is a clever non‑return valve designed to open only during discharge and then automatically close to block foul odours and sewer gases. Ideal for under‑sink, bath or bidet installations, it fits both horizontal and vertical positions for flexible UK plumbing installs.

The Viva 1½″ Magna Self‑Sealing Waste Valve WTSTC40 is a versatile non‑return waste valve with an internal membrane that allows water to discharge and then automatically seals to block foul smells and gases. Ideal for installation under sinks, basins, baths, bidets or urinals, it includes 90° inlet and straight compression adapters and can be fitted vertically or horizontally.

The Worcester Bosch Wireless Greenstar Heating System Care Packs allow you to extend the life of the boiler with Worcester system filter to collect debris, the inhibitor to protect your system after install and a cleaner to use before installation to make sure your system is ready for your new boiler. This pack will also give your new Worcester boiler an extended guarantee. (Refer to manufacturer website for details)
This pack also comes with the Wireless EasyControl so you can control your boiler from your phone.
***Additional accessories are needed for system boilers. The Bosch EasyControl can also be fitted with our 8000 Life regular, 27Ri and 30Ri with additional accessories.***

The Wyndam Branded Build Cert Calmag Chemical Inhibitor (1L) WYN-BC-1000 is a premium solution designed to protect your heating system from scale and corrosion. Formulated to meet BuildCert standards, it ensures optimal performance and longevity of your boiler and radiators. Easy to use and highly effective, this inhibitor is a must-have for maintaining efficient heating systems.

The Fernox Electrolytic Scale Reducer 22mm Compression is an in-line water treatment device designed to help prevent the build-up of limescale throughout the home.

Using electrolytic principles, it alters the structure of hardness salts in the water, encouraging them to coagulate and helping reduce the formation of scale in appliances and hot water systems. It provides whole-house protection against limescale and is effective immediately after installation.

The scale reducer is maintenance-free and can be installed on horizontal or vertical pipework using 22mm compression fittings. Under average domestic water usage, it can remain effective for up to 10 years, depending on water usage levels.

The unit is made from forged, nickel-plated brass and is WRAS approved. It is pressure rated to 10 bar at 20°C and is designed for cold feed applications.

Fernox Biocide F7 200ml is a high-performance biocide designed to prevent bacterial contamination and fungal growth in underfloor heating, low-temperature heating and chilled systems.

It also helps clean and prevent the recurrence of microbiological fouling, including jelly-like deposits caused by fungal growth in feed and expansion cisterns. Biocide F7 starts working within 24 hours and provides both short-term disinfectant action and longer-term preservation.

One 200ml bottle treats up to 150 litres of system volume or up to 280m² of underfloor heating. Fernox recommends using Biocide F7 alongside a Fernox Protector, such as Protector F1, to provide protection against corrosion and scale.