Closed System Water Treatment

We blend all our chemicals here in the UK in our ISO 9001 accredited production facility for our clients and toll blend.

Closed System Water Treatment Chemicals & Service

closed system chemicalsFeedwater is a manufacturer and supplier of a range of high-quality water treatment chemicals for all types of closed circuit heating, cooling and chilled water systems.

Closed circuit or closed loop water systems are a convenient way of heating or cooling building services applications and industrial and commercial processes. As the name closed loop suggests the intention is generally to retain the same water in the system for an indefinite period which means that without effective water treatment corrosion products and foulants can build up impairing flow and heat transfer and control valves can become blocked and inoperative. Heating systems can become scaled up; chilled water systems can become choked with pseudomonas slime-forming bacteria. A poorly treated closed circuit water system will be wasting your money long before it starts to leak.

To overcome these many potential problems we have developed a comprehensive range of cost effective inhibitors and biocides which are designed specifically for closed systems. If your system is already suffering because of inadequate water treatment don’t despair because we can provide products and services which will restore flow and heat transfer to even heavily fouled systems.

If you are looking for chemicals without service you can find our most popular products available to order online in the tabs below >>

Technical Questions

We often get questions relating to the control of closed water systems, some of the most frequent are included below, the buttons will link to articles, products and lists to help you identify how to correctly treat your closed system.

To take advantage of our free consultancy service and have one of our service consultants visit your site see the Consultancy Service tab above.

Closed System Corrosion Inhibitors

Closed circuit inhibitors are matched to the system metallurgy and operating temperature. Most of the inhibitors are designed to protect a range of different metals but particular care needs to be taken if a system contains aluminium.

Corroban 22 is a DEHA based oxygen scavenger which is used in the treatment of HTHW systems.

BuyOnlineButtonCorroban 40 is an industry standard nitrite based closed circuit corrosion inhibitor for LTHW and chilled water systems. Not suitable for systems containing aluminium. 

BuyOnlineButtonCorroban 41 is a new generation synergised nitrite closed system inhibitor which gives the same level of protection as traditional treatments but at a much lower dosage rate. It is ideal for MTHW, LTHW and chilled water systems. Not suitable for systems containing aluminium.

Corroban 42 is a special synergised nitrite treatment developed specifically for heating and chilled water systems containing aluminium.

Corroban 48P is a highly concentrated nitrite based chilled water corrosion inhibitor that can also be used for LTHW and other closed systems incorporating a pink pH indicator. Not suitable for systems containing aluminium.

BuyOnlineButtonCorroban 50 is a synergised molybdate / organic corrosion inhibitor which is ideal for MTHW, LTHW and chilled water systems, including those containing aluminium. Because it is a synergised blend it is able to provide excellent protection at much lower molybdate reserves and much lower cost than conventional molybdate treatments.

Corroban 55 is a synergised closed loop corrosion inhibitor which incorporates both nitrite and molybdate. It is ideal for MTHW, LTHW and chilled water systems. Not suitable for systems containing aluminium.

BuyOnlineButtonPolytan 4F is a tannin based oxygen scavenger and heating system corrosion inhibitor which is used in the treatment of larger, predominantly steel, systems which can be used across the temperature range from chilled water to HTHW systems.

Corroban 50 Molybdate Corrosion Inhibitor

£102.00£174.00 exc. VAT
Rated 4.00 out of 5
  • Synergised Molybdate Corrosion Inhibitor
  • Cost effective
  • Non-toxic and easy to use
  • Excellent protection
  • Protects steel, cast iron, copper, brass, aluminium and galvanised steel
  • Can be used in systems with aluminium (see note*)
  • Suitable for chilled water, LTHW and MTHW systems

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Save money with our complete closed system protection bundle, Corroban 50, Biocide & Molybdate Test Kit Click Here

Description and usage instructions below.

Corroban 40 Nitrite Corrosion Inhibitor

£150.00 exc. VAT
  • Traditional nitrite based inhibitor
  • Cost effective
  • Excellent protection
  • Protects steel, cast iron, copper & brass
  • Not recommended for aluminium
  • Suitable for chilled water, LTHW systems

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Save money with our complete nitrite protection bundle, Corroban 40, Biocide & Nitrite Test Kit Click Here

Description and usage instructions below.

Corroban 41 Nitrite Corrosion Inhibitor

£290.00 exc. VAT
  • Synergised nitrite based inhibitor
  • Low dosage rate
  • Highly cost effective
  • Excellent protection
  • Protects steel, cast iron, copper & brass
  • Not recommended for aluminium
  • Suitable for chilled water, LTHW and MTHW systems

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Don’t forget your Biocide and Nitrite Test Kit!

Description and usage instructions below.

Polytan 4F 25KG – Tannin Polymer Alk Blend

£181.00 exc. VAT
  • Traditional Tannin based Corrosion Inhibitor
  • Very cost effective
  • For large, predominantly steel systems
  • Excellent protection
  • Protects steel, cast iron, copper, brass
  • Not suitable for aluminium
  • Suitable for chilled water, LTHW, MTHW and HTHW systems

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Description and usage instructions below.

Closed System Biocides

If untreated closed heating/cooling systems can become a breeding ground for a range of troublesome microbes such as pseudomonas, nitrifying and sulphate reducing bacteria. They can cause fouling, destroy closed loop inhibitors and cause MIC (microbially induced corrosion).

A chilled water biocide is essential to prevent slime growth and we would always recommend a closed circuit biocide is incorporated in any system operating below 80 °C.

BuyOnlineButtonBiocide ITA is a broad spectrum closed loop biocide which effectively controls all the commonly encountered bacteria in closed water systems.

*Use biocides safely. Always read the label and product information before use.*

Glycol Antifreezes

BuyOnlineButtonCorrofreeze is an inhibited mono ethylene glycol antifreeze designed specifically for use in chilled water systems in industrial and building services HVAC applications.

Corrofreeze BPC is food-grade and pharmaceutical grade propylene glycol.

BuyOnlineButtonCorroban 90 and 99 are food-grade inhibited propylene glycol antifreezes that can also be used as bacteriastats to safely control microbial growth in food production applications.

Biocide ITA General Purpose Biocide

£156.00£290.00 exc. VAT

Open and Closed System Biocide

  • Controls microbial growth
  • Broad spectrum of activity
  • Effective against Pseudomonas
  • Cost effective
  • For chilled water, LTHW and open cooling systems

Description and dosage instructions below.

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Corrofreeze 25KG – Antifreeze

£88.00 exc. VAT

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Description and usage instructions below.

Closed Loop Cleaning Chemicals

We produce a range of heating system cleaning chemicals and closed system chemicals for pre-commission cleaning, descaling and renovation cleaning of all types of closed circuit water systems.

Follow the link to find out more.

Descalers and Chemical Cleaners

Descaler SF 25KG Acid cleaner

£80.00 exc. VAT
  • Based on Hydrochloric Acid
  • Incorporates film forming inhibitor
  • Protects carbon steel, copper & brass
  • Highly effective penetrant
  • Dissolves limescale & rust

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.

Neutralising Powder 25KG

£73.00 exc. VAT

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.

Acid Descaling Powder 25KG

£206.00 exc. VAT
  • Incorporates protective film inhibitor
  • Protects mild & stainless steel, copper & brass
  • Effective penetrant & dispersant
  • Dissolves limescale

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.

Alkbuild 25KG Alkalinity Builder

£73.00 exc. VAT
  • Neutralises acidity
  • Raises pH
  • Increases alkalinity
  • Multiple uses
  • High strength
  • Cost effective

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.

Corrosperse 84 Cleaning Agent

£136.00£212.00 exc. VAT
Rated 4.00 out of 5

Closed System Cleaning Agent

  • Non-acidic & non-aggressive
  • For pre-commission & older systems
  • Dissolves and disperses
  • Safely discharges to sewer*

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Description and usage instructions below.

Acid Cleaner & Descaling Bundle

£164.00£263.00 exc. VAT
Rated 5.00 out of 5

Safety Data Sheet emailed upon order.

For business and contractors use only.
Product unsuitable for public & domestic usage.

Product description and usage details below.

Chemical Reserves

This can very much depend on the exact blend that your supplier uses in their closed system inhibitor chemicals but we can give you an overview of what chemical reserves we recommend for Feedwater products.

All recommended reserves are stated on the product pages within the shop.

Molybdate Inhibitor (Corroban 50)

As a synergised Molybdate based inhibitor we have two different chemical reserves we recommend.
For systems without Aluminium we recommend a minimum of 33mg/l of Molybdate reserve
For systems with Aluminium where greater protection is needed we recommend minimum 66mg/l Molybdate reserve

Traditional Nitrite (Corroban 40)

A traditional Nitrite blend the chemical reserves we recommend comes down to one result as we do not recommend using with Aluminium systems. You should dose to meet a reserve of 1200mg/l minimum.

Synergised Nitrite (Corroban 41)

Our Synergised Nitrite blend has the benefit of requiring a much love nitrite reserve as the mix of organic and inorganic inhibitors offer protection at lower levels making it a much more cost effective solution. You should dose to meet a reserve of 200mg/l minimum.

Traditional Tannin (Polytan 4F)

Tannin again is not suitable for Aluminium and lends it self to be a cost effective solution to very large and high pressured closed systems. The operator should look for a chemical reserve within the range of 12 – 20 tannin units.

Further information regarding chemical reserves, what systems and materials are compatible with which treatments are available on the product pages.

Not sure how big your systems are? Speak to us today to arrange a free consultation.

Dosing Equipment

Feedwater stock and supply dosing equipment for closed water systems. Contact us about ordering dosing pots and other dosing equipment.

Chemicals with Service

Any treatment chemical is only as good as the service that accompanies it and we’ve been treating closed systems for nearly 40 years. Our regional consultants look after hundreds of sites across the UK and are experts in the treatment of boilers so contact us today for all your closed loop water treatment chemicals and service requirements.

own label chemicalsOwn Label Boiler Water Treatment Chemicals

We can supply you with our closed system water chemicals with your own label on the drum. So if you are a water treatment service company, a closed water system specialist supplier or an FM company looking to increase your added value, why not contact us because we can help you.

Export Distributors Wanted

We are always looking for professional overseas partners and distributors, so if you are a water treatment specialist looking for an alternative supplier for your water treatment products, or you believe you have the capability to establish a high-quality water treatment service operation in your own territory, then please contact us.

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