The Making Of 100%

Pure Water


We make 100% pure Water at our head office .



The water fed pole window cleaning system works by pumping pure water from the van up through a carbon fiber or fiber glass pole on to the window; this is then scrubbed, rinsed and left to dry naturally to leave a streak free finish










As the water has been reduced to its natural state

it has far more dissolving power, so it literally sucks up the grime from the window leaving windows sparkling clean.

Window cleaners have traditionally used methods of window cleaning that use detergents which leave behind a residue that allows dirt to stick to it. The water fed pole window cleaning system does not leave anything behind and so, windows stay cleaner for longer.





Reverse osmosis


This remarkable system uses a membrane technology to separate out the majority of organic and inorganic impurities in water. The purity of the resulting water is around 94 to 98% depending on the incoming water quality. In some areas of the country the incoming water is so soft (Wales and Scotland) that the water is good enough to be used directly on glass. In other areas (the South East) RO requires the water to be pre-treated (softened) to protect the membrane. Even then the resulting water quality still requires to be further improved using a deionised (DI) resin.





Deionisers are the water treatment backbone of the water fed pole industry. They use a resin which is able to take raw tap water and remove virtually all contaminants giving a 99.9% purity rating. This is good enough to use straight on the glass. The equipment (a cylinder containing DI resin) is straightforward to understand and easy to use. As Di resin can be exhausted fairly quickly in this mode it is often criticised for its expense but the simplicity of the system is a huge benefit. Most customers use deionisers as a ‘polishing’ medium after RO. This lifts the purity rating from 98% to 99.9%. As this improvement in purity is so small the resin can last a considerable period of time.


Reverse osmosis


Pre-treatment is important when working with RO and nanofiltration (NF) membranes due to the nature of their spiral wound design. The material is engineered in such a fashion to allow only one way flow through the system. As such the spiral wound design doesn't allow for backpulsing with water or air agitation to scour its surface and remove solids. Since accumulated material cannot be removed from the membrane surface systems they are highly susceptible to fouling (loss of production capacity). Therefore, pretreatment is a necessity for any RO or NF system. Pretreatment in SWRO system has four major components:

Screening of solids: Solids within the water must be removed and the water treated to prevent fouling of the membranes by fine particle or biological growth, and reduce the risk of damage to high-pressure pump components.

Cartridge filtration - Generally string-wound polypropylene filters that remove between 1 - 5 micrometre sized particles.

Dosing of oxidizing biocides such as chlorine to kill bacteria followed by bisulfite dosing to deactivate the chlorine which can destroy a thin-film composite membrane. There are also biofouling inhibitors which do not kill bacteria but simply prevent them from growing slime on the membrane surface.

Prefiltration pH adjustment: If the pH, hardness and the alkalinity in the feedwater result in a scaling tendency when they are concentrated in the reject stream, acid is dosed to maintain carbonates in their soluble carbonic acid form.

CO3-2 + H3O+ = HCO3- + H2O

HCO3- + H3O+ = H2CO3 + H2O

Carbonic acid cannot combine with calcium to form calcium carbonate scale. Calcium Carbonate Scaling tendency is estimated using the Langelier Saturation Index. Adding too much sulfuric acid to control carbonate scales may result in calcium sulfate, barium sulfate or strontium sulfate scale formation on the RO membrane.

Prefiltration Antiscalants: Scale inhibitors (also known as antiscalants) prevent formation of all scales compared to acid which can only prevent formation of calcium carbonate and calcium phosphate scales. In addition to inhibiting carbonate and phosphate scales, antiscalants inhibit sulfate and fluoride scales, disperse colloids and metal oxides and specialty products exist to inhibit silica formation.


















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