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When referring to people we often say, "It's what inside that counts" - and this couldn't be more true when trying to evaluate shower filters. Therefore in this article we will be discussing the various types of shower water filter mediums (the stuff inside shower filters that actually filter the water). We will look at each of the leading types of shower filter mediums, discuss how they are produced, explain their virtues and also make note of their inferior aspects.
Granular Active Carbon (GAC)
By far this is the most common type of filter medium in a shower water filter. It is mainly so popular because it is relatively cheap to produce and has great filtering properties. Because of it's microporosity a single gram of this material has a surface area which exceeds 500m squared, which gives it great filtering properties.
In the past GAC was produced primarily by producing charcoal from wood and coal, but these days most GAC in water filters are made from carbonaceous materials such as nutshells and coconut husk - making these products once destined for the rubbish tip a valuable resource again.
Generally most multi-stage filters of any type will include at least one layer of GAC as a filtration stage. This is the same for many shower filters. Yet it is not just water filtration that can be achieved through using GAC, it also can filter; gas, oils, chemicals and can even be used to treat poisonings and overdoses by simply investing it. As a filter it really is a miracle product, no wonder it is used so much.
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Kinetic Degradation Fluxion - KDF
This type of filter medium is the golden child of the shower filter world (it literally is golden in colour as well!). KDF is a patented filter medium discovered and produced by the company KDF Fluid Treatment Inc. based in the USA. The medium was discovered by Don Heskett in the 60s and since then has gone on to be recognised and utilised by many government bodies including the United States Environmental Protection Agency - who classify it is a 'pesticidal device' because of it's great ability to kill bacteria and other microorganisms.
KDF is produced in a method that uniquely combines copper and zinc, this combination creates a fine golden sand like substance that creates an electrochemical reaction when water passes through it. This reaction changes the chemical make up of the harmful substances in water (such as chemicals like chlorine) and turns them into benign substances that are not harmful. Also this reaction causes heavy metals in the water to plate out (stick to) the medium's surface, therefore removing them from the water. Dangerous microorganisms such as algae, fungi and bacteria are also instantly killed when they touch KDF.
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Vitamin C
Filtering water with Vitamin C is one of the newest filter mediums found in shower water filters. One noticeable difference with this type of filter medium as opposed to the above two filter mediums is that it can only be found in shower filters. Vitamin C to filter water is not found in any industrial water filter processes and has not been approved by any scientific foundations or government agencies to provide suitable water filtration needs.
Vitamin C water filters work to neautralise Chlorine found in water. The chemical is actually called ascorbic acid (otherwise known as Vitamin C) and when Chlorine comes into contact with this chemical it reacts to it and turns the Chlorine into a harmless substance.
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In conclusion from the above we can see that the best type of shower water filter medium is not one single filter medium, but a shower filter that incorporates multiple mediums (such as KDF and GAC). Yet no matter what type of shower filter one decides on getting, at the very least by installing a shower water filter at the very least we are protecting ourselves from harmful chemicals in our water supplies.