How Do Water Filters Work?
What are Water Filters?
Water Filters remove unwanted impurities from water such as sediment, taste and odour, hardness and bacteria to result in better quality water. From producing better-tasting drinking water to more specialist applications such as brewing coffee and making crystal clear ice, we offer a huge range of filters and cartridges to solve any number of water-related issues.
The 5 Types of Filters
Subject to your application, i.e. what you�re trying to remove or in some circumstances trying to stop, there are 5 types of water filters:
- Mechanical Filters
- Absorption Filters
- Sequestration Filters
- Ion Exchange Filters
- Reverse Osmosis Filters
Each one of these addresses a different water problem and many filters actually use a combination of these methods to perform multiple levels of filtration.
How Do They Work?
Water is one of the most important substances on the planet, it covers 71% of the Earth�s surface and the human body can contain as much as 75% of the stuff. Water is vital to a huge number of applications including agriculture, science, medical, transportation, heating, recreation and food processing as well as washing and perhaps most important of all: drinking.
For the majority of us, drinking water comes from a treated municipal supply which is safe to drink but will often feature unpleasant tastes and odours from chemicals such as chlorine which are used to disinfect the water and keep it free of germs and bacteria. Depending on where you live, you may also find that your mains water causes limescale deposits to form which can block pipes and damage appliances. These issues, chlorine taste / odour and limescale formation are just two among a host of other common water problems which can be solved by water filtration. But how do water filters actually work?
Mechanical
The basic idea of mechanical filtration is to physically remove sediment, dirt or any particles in the water using a barrier. Mechanical filters can be anything from a basic mesh that filters out large debris to a ceramic filter which has an extremely complex pore structure for ultra-fine filtration of pathogenic organisms.
A filter that utilises mechanical filtration will usually be given a micron rating which indicates how effective the filters are in terms of the size of the particles it is capable of removing. Common ratings you might see include:
- 5 micron � Will remove most particles visible to the naked eye.
- 1 micron � Will remove particles which are too small to see without a microscope.
- 0.5 micron � Will remove cysts (giardia and cryptosporidium).
Absorbtion
Absorption in water filters is most commonly carried out by carbon, which is highly effective at capturing water-borne contaminants. The reason carbon absorbs contaminants so readily is that it has a huge internal surface which is jam packed with nooks and crannies that can trap chemical impurities such as chlorine.
Most common domestic filters contain granular activated carbon (GAC) which reduces unwanted tastes and odours by absorption. More expensive filters use carbon block elements which are generally more effective and usually carry a micron rating for particle removal.
A variety of different substances can be used to make carbon for filters including wood and coconut shell, with coconut shell filters being more effective but also more expensive.
Sequestration
Sequestration is the action of chemically isolating a substance. Food grade polyphosphate is commonly used in scale inhibiting filters to sequester the calcium and magnesium minerals which cause limescale and corrosion. However, polyphosphate is generally only introduced in very small amounts and it only inhibits scale rather than eradicating it. This means that polyphosphate does not soften the water but instead works to keep the minerals within the solution, preventing them forming as scale on any surfaces they come into contact with.
Due to the hard minerals still being present in the water, scale inhibition isn�t suitable for all applications. Instead, water softening using a process such as ion exchange is usually recommended in water areas with alkalinity levels of 180ppm or more (very hard water) and applications where water is kept at a constant temperature of 95�C or more.
Ion Exchange
Ion exchange is a process used to soften hard water by exchanging the magnesium and calcium ions found in hard water with other ions such as sodium or hydrogen ions. Unlike scale inhibition, ion exchange physically removes the hard minerals, reducing limescale and making water suitable for applications where it is kept at a constant high temperature e.g. in commercial coffee machines.
Ion exchange is most commonly carried out using an ion exchange resin which normally comes in the form of small beads. A similar type of resin is used in some Water Softeners and in the case of a water softener the resin utilises sodium ions which need to be periodically recharged to prevent the resin becoming ineffective. As water filters are usually sealed units you would simply replace the filter with a new one though it should be noted that
Calcium Treatment Units (CTUs) can be returned to the supplier and regenerated.
Resins that utilise sodium ions aren�t usually used in drinking water filters as the amount of salt (sodium) that can be present in drinking water is legally limited to 200 milligrams/litre. As sodium ion exchange increases salt levels, a hydrogen based ion exchange resin is the preferred option for filters.
Reverse Osmosis
Reverse osmosis (RO) is the process of removing dissolved inorganic solids (such as magnesium and calcium ions) from water by forcing it through a semipermeable membrane under pressure so that the water passes through but most of the contaminants are left behind.
Reverse osmosis is a highly effective way of purifying water and is usually combined with a number of other filters such as a mechanical (sediment) filter and an absorption (activated carbon) filter in order to return water with few contaminants remaining.
Reverse osmosis systems use water pressure to force water through the membrane so it uses no electricity, though a certain amount of waste water is produced that has to be sent to the drain. The extra filters involved in multi-stage water filtration can make a reverse osmosis unit more expensive than other filtration methods but in applications where 99.9% pure water is required, RO offers the finest level of filtration available as is increasingly being used to treat water made for Coffee
Combinations
Each filtration method has limitations on what it can remove, so most water filters or filtration systems use a combination of methods to achieve a specific level of water purity. To give an example, household water jug filters will generally use mechanical, absorption and ion-exchange whereas inline filters will utilise mechanical and absorption with the possible inclusion of sequestration if the filter is designed to inhibit scale. Reverse osmosis systems can utilise mechanical, absorption and of course reverse osmosis depending on how many stages the RO system has.
By understanding of the five different methods by which water can be filtered and the way they can be combined, you should hopefully find it easier establishing which kind of filters you need for any given application.
Water Filter Systems
Water Filter systems remove unwanted tastes and odours from mains water to provide clean, fresh-tasting water straight from your tap. The domestic systems such as a Watergem are compact and easy to install under a sink or small space. Commercial water filter systems are slightly different depending on the use in the kitchen or on the speciality equipment. Water filter systems come fully equipped with the kit to get you set up and tapped in to the existing water line.
Coffee Machine Water Filters
Water is imperative in making the perfect coffee. Normal filtration rules don�t apply to the coffee bean which needs a very special blend of minerals before it will release its full flavour. This, complete with protecting and cleaning expensive espresso machinery means coffee machine filters are another level, luckily we are well equipped to handle coffee machine water filters
Inline Water Filters
Inline filters sit directly on the water line or appliance and the water passes through the filter before reaching the tap or appliance. Commonly used in households this type of filtration is perfect for under-sink installations due to its small size.
Inline filters can reduce common problems with municipal water such as chlorine taste, odour and bacteria�s providing bottled water tasting water without the plastic waste. The Hydro + range of inline water filters are one of Europe�s top selling filters.
Drop In Filters
Drop-in filters are made to fit inside of a water filter housing. Housings vary depending on the use but the most common sizes are 10? and 20?. We also stock Jumbo housings and the Watts Big Bubba housing
Fridge Filters
Fridge filters are required to filter the feed water coming through to the drinking water and ice mechanism. Most commonly found on American style fridge freezers, the size and compatibility of the filter varies depending on make/model and style of the fridge freezer.
Water Filters for Commercial Foodservice
Combi ovens rely on good quality water for their steam. The chemical reaction of poor-quality water being heated to produce steam or hot water, is a main contributing factor of causing limescale which can lead to breakdowns. Everpure Claris are one of the most trusted brands and supply catering equipment manufacturers and their service partners tailored combi oven filters
https://www.aquacure.co.uk/knowledge-base/how-water-filters-work
The article following next relating to Water Filters is incredibly insightful. Read it yourself and see what you think about it.
The majority of people think that water filtering system systems are the same as reverse osmosis. Actually, reverse osmosis is the only sort of water filtering that purifies water using an usual and also effective method, the purification procedure.
Conventional and various other kinds of water filtering systems are made up of three various processes, yet each one has its own advantages. To make it easy to see what these advantages are, I will go over each kind of filtering system.
The very first type of purification innovation is ion exchange. This is a prominent option for people with delicate skin. It will certainly remove the fluoride existing in your tap water.
In the past, this sort of filtration systems made use of chlorine and light weight aluminum to soak up the harmful effects of the naturally taking place fluoride. Today, this approach is changed by carbon that has the capability to store and also release hazardous chemicals in an extra environmentally-friendly method.
One more type of water purification systems is known as submicron filtering. It gets rid of germs, tiny plant matter, as well as many contaminants from water, while retaining its good taste and also smell. It is usually used in public water treatment centers, due to the fact that it is a common incident in public water materials.
Chlorine sanitation modern technologies make use of chlorine to eliminate viruses as well as microorganisms. These approaches work, however when not utilized appropriately they can harm water pipes as well as membrane layers. This is why it is extremely essential to just utilize these methods on cured water supplies.
Carbon filters also carry out in a variety of water filtration systems. When combined with water, carbon can eliminate all kinds of contaminants and natural contaminants from water. Nevertheless, they are not created to remove cysts, which are microscopic pathogens that are formed naturally in water.
RO water purification systems are really effective at eliminating cysts as well as damaging chemicals. The technology was initially made to be used with residential water sources, yet modern-day innovation makes it a lot more reliable than ever before. RO systems are really efficient in eliminating lead, mercury, arsenic, bromine, chlorine, THMs, VOCs, and THF from drinking water.
RO as well as chlorination innovation is the safest as well as most economical method of water filtration available today. It is extremely economical because it does not call for making use of unsafe chemicals or synthetic solvents. It also makes the water a lot more conveniently offered to our households.
On the other hand, reverse osmosis water purification systems do not work as efficiently. They remove all kinds of contaminants including oxygen, which is a vital element of life. Reverse osmosis water filters can make water unbreathable, which is a significant worry for those suffering from bronchial asthma.
Kinds of water filters include turned on granular carbon, charcoal filters, as well as carbon block purification. Carbon block filtration is a more effective approach than traditional granular carbon filters. It will certainly eliminate both my review here chlorine and metals, so it is a good choice for families with youngsters who struggle with health problems, like rashes as well as acne.
Health is too crucial to forget and also we need to deal with our environment as well as our family members. We are shedding important sources daily, as well as the longer we wait to do something about it, the more priceless natural resources will certainly become. If you have been subjected to undesirable or polluted water, there is aid available.
Hopefully you liked our excerpt about Fresh Water Filtration Systems. Thank you for spending some time to browse our article post. Those who liked our blog posting if you please remember to pass it around. Thanks for taking the time to read it.