Reverse Osmosis Chemicals
Unit B Badex Building
Westbrook Park
Old Trafford
Manchester M17 1AY
United Kingdom

t: +44 (0) 330 223 31 31

Reverse Osmosis FAQ Print E-mail

About Reverse Osmosis

Reverse Osmosis Products

About Reverse Osmosis Chemicals International




About Reverse Osmosis


What is reverse osmosis?

Reverse osmosis, often abbreviated to RO is a technique employing a membrane which is “semi permeable” that is; under the influence of pressure a larger proportion of water (the solvent) passes through the membrane than do the dissolved salts or organic molecules (the solutes).Chlorine dioxide.

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When was the process of reverse osmosis first discovered?

The natural process of reverse osmosis was first described by a French Scientist in 1748, who noted that water spontaneously diffused through a pig bladder membrane into alcohol. However, it was not until the 1950’s, as a result of research funded by the Office of Saline Water in the USA that practical reverse osmosis membranes capable of discriminating against small ions were developed.

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What is osmotic flow and how does it work?




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What are commercial reverse osmosis membranes made from?

Two materials make up the bulk of commercial reverse osmosis membranes, they are cellulose acetate and an aromatic polyamide.

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What are cellulose acetate membranes?

Cellulose acetate has a higher flux and a smaller area of membrane is therefore required. It is also resistant to small concentrations of free chlorine and may therefore be kept free of bacteria and also produce a product with residual chlorine in it to prevent subsequent re-growth.

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What are polyamide membranes?

The polyamide membrane can be used at a higher temperature (35 oC) than cellulose acetate (30 oC), it cannot tolerate chlorine but is not attacked by bacteria whereas some bacteria which can occur in surface water in woodlands actually destroy cellulose acetate. Finally, polyamides can be used over a much wider pH range (4-11) than cellulose acetate (4-7.5).

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Reverse Osmosis Products


What reverse osmosis products are available from Reverse Osmosis Chemicals International?

An operational management programme developed by Reverse Osmosis Chemicals International will help improve and then maintain high recovery rates, improve operational efficiency; and reduce scaling and corrosion risks. We offer a full range of advanced technology chemicals that offer significant operational performance benefits: 

Biocides and disinfectants >>

Corrosion inhibitors >>

De-chlorinators >>

Flocculants >>

Membrane cleaners >>

Scale inhibitors >>

Silt Density Index monitoring kits >>

Microbiological analysis >>

Membrane autopsy analysis >>

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What biocides and disinfectants are available?

We have a range of innovative technically advanced biocides and disinfectants developed for use in reverse osmosis systems:

ROCbio DBNPA -  fast-acting, non-oxidising, antimicrobial reverse osmosis bio-control formulation with a broad spectrum of activity...

ROCbio 50 -  non-oxidising, non-ionic antimicrobial reverse osmosis disinfectant formulation based on 0.5% isothiazalone...

ROCbio 150 - non-oxidising, non-ionic antimicrobial reverse osmosis biocide formulation based on 1.5% isothiazalone...

ROCbio 300 - non-oxidising, non-ionic antimicrobial RO disinfectant formulation based on 3.0% isothiazalone...

ROCbio Silver - eco-friendly, multi-component oxidising biocide utilising a stable combination of hydrogen peroxide and silver (H2O2/Ag) ions...

ROC Chlorine dioxide - we offer several alternative products that will deliver varying amounts of high purity chlorine dioxide suitable for reverse osmosis applications...

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What corrosion inhibitors are available?

We have a range of innovative technically advanced corrosion inhibitors developed for use in reverse osmosis systems:

ROCguard 750 - a liquid blend of sodium silicate and sodium hexametaphosphate for inhibiting corrosion and "red water" problems...

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What de-chlorinators are available?

We have a range of innovative technically advanced corrosion inhibitors developed for use in reverse osmosis systems:

ROCdeChlor 20 - an excellent reverse osmosis de-chlorinator based on sodium metabisulphite and used for the elimination of residual chlorine...

ROCdeChlor 40 - an excellent RO de-chlorinator based on sodium bisulphite...

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What flocculants are available?

We have a range of innovative technically advanced flocculants developed for use in reverse osmosis systems:

ROCfloc 40 - a liquid polymer designed to aid precipitation of suspended solids such as iron oxide, mud and other soft foulants...

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What reverse osmosis membrane cleaners are available?

We have a range of innovative technically advanced RO membrane cleaners developed for use in reverse osmosis systems:

ROCclean 66 -  general-purpose membrane cleaner designed to support the cleaning of acid insoluble sulphates of calcium, barium... 

ROCclean 67 - cleans reverse osmosis (RO), nano-filtration (NF) and ultra-filtration (UF) membranes...

ROCclean 68 - removes iron fouling from reverse osmosis and nano-filtration membranes...

ROCclean 69 - liquid blend of dispersants and inorganic builders with an amphoteric surfactant...

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What RO membrane scale inhibitors and antiscalants are available?

We have a range of innovative technically advanced RO membrane scale inhibitors and antiscalants developed for use in reverse osmosis systems:

ROCscale 51 - high performance super-threshold membrane scale inhibitor...

ROCscale 91 - membrane scale inhibitor developed for use with high silica waters...

ROCscale 95 - antifoulant for use in reverse osmosis and nano-filtration membrane systems using sea water or high salinity estuarine waters...

ROCscale 110 - super-threshold agent able to stabilise a wide range of supersaturated salt... 

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What Silt Density Index monitoring equipment is available?

Wehave two precision SDI test instruments that allow the accurate monitoring and analysis of Silt Density Index:

Manual SDI test kit

Automatic SDI test kit

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About Reverse Osmosis Chemicals International


Who are Reverse Osmosis Chemicals International?

Reverse Osmosis Chemicals International are world leading reverse osmosis technology specialists pioneering the development of high performance RO chemicals, performance monitoring equipment and service solutions. Our chemical products are based on advanced formulations and include membrane cleaners, anti-scalants, biocides and flocculants.

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How do I contact Reverse Osmosis Chemicals International?

If you would like to contact Reverse Osmosis Chemicals International please use our Contact Us page. We look forward to hearing from you.

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I have a technical question

If you have a technical question regarding the use of our products please use our Technical Support page. Once we received your enquiry one of our technical specialists will respond to you directly. We look forward to hearing from you.

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Careers at Reverse Osmosis Chemicals International

Reverse Osmosis Chemicals International are always looking for gifted, motivated individuals with the energy, creativity and commitment required to fulfill ambitious goals. If you are considering your future and are looking for somewhere to make a real difference please send your details to our careers centre ... careers >>

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Are distributor opportunities available?

Yes, for further details please contact us.

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Is training available?

Yes, we offer advanced technical training on the selection, installation and operation of all our products, equipment and systems.

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Is technical support available?

Yes, we offer a dedicated technical support facility giving direct access to specialist technical advisors across our complete range of products.

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