Water Filtration

You may be surprised to know that not all water treatment procedures result to pure water. In most cases, chemicals, pharmaceuticals and microorganisms can still linger even after going through reservoirs and plants so what comes out of your tap may not be suitable for drinking. Learning the water purification process will guarantee that you use only the right devices.

Explain Water Purification

Water purification process involves the removal of harmful microorganisms, chemicals and other known contaminants from raw water sources. Via a designed treatment profile that limits the inclusion of particular matter, water is produced effectively for specific purposes. Water is purified for human use and consumption or drinking water while certain requirements are also needed for water used in the fields of chemistry, medicine, pharmacology and industry. Some of the known methods include filtration, distillation, ultraviolet radiation and deionization.

The government indicates the standard for quality of drinking water wherein minimum and maximum set points of contaminants as well as control elements are made for safe drinking water. Specific amounts of disinfectants such as chlorine are controlled and required to produce the right quality after water leaves the plant to prevent recontamination.

Methods and Safety

Bottling is another type of water purification process which is considered only as safe as the source. In the past, cholera epidemics have resulted from contaminated bottled water. People should not consider bottled water similar to pure water since studies were conducted which showed that several different brands had enteric pathogens even after treatment. Carbonated water may be better because of its acidity which can destroy bacteria and other microorganisms.

Heat or boiling destroys microorganisms and all enteropathogens are destroyed at below boiling temperatures. Once water boils, disinfection is already achieved even in very cold places. There is no need to continue boiling for 5 to 20 minutes.

Chemical Treatments

Chemical disinfection can best explain water purification via the different reactions of present substances and contaminants. Halogens like chlorine and iodine are the most common chemical disinfections since these can destroy most bacteria, amoeba and Giardia cysts and viruses. The effectiveness of each chemical depends on the chemical concentration, water temperature and contact period. It may take longer contact time for water with lower concentrations or temperature. Sediments increase halogen need and flavors should only be added after the recommended contact period.

Chlorine and More

Chlorine is the most widely used element in the water purification process since it is able to destroy so many types of pathogens. However, there are some that object to the resulting taste as well as its unreliability in destroying Giardia cysts in basic concentrations. Halazone tablets are affordable and convenient but may require up to 6 tablets per liter for a contact period of 1 hour. The chemicals also lose effectiveness with warm humid air and causes poor flavour.

Superchlorination-dechlorination is composed of 2 steps and is considered inconvenient. Initially, chlorine in high concentrations are developed followed by its removal with the addition of peroxide.

Iodine is also used in water purification process for almost 100 years with advantages over chlorine in convenience and efficacy. It is ideal for short and intermediate length usage anywhere from 3 to 6 months. However, there seems to be a trigger for people allergic to iodine, pregnant women and individuals with hyperthyroidism.

In closing, water purification is not the same as water filtration. When it comes to selective filtration on a residential or commercial basis, my recommendation is to leave it to your local water utility to handle the water purification and take matters from there into your own hands by purchasing any one of a number of quality water filtration systems to ensure you’re getting the best and safest water.

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Are you concerned about the quality of the water you get in your house and you are at the stage of looking for the best water purification technology?

In this article, I will give you a broad overview of the different methods of water purification that are now commercially available and offer you some guidance on selecting the right one for your home.

There are four basic types of water purifiers for home use:

1. Filters: All filters use an active substance that traps, absorbs, or modifies pollutants in the incoming water. This substance is called a medium and there are different types of media. The most common is carbon. The way that they trap pollutants also varies. For example, some use mechanical action, while others employ a process called adsorption, in which pollutants are trapped with chemical attraction. There are different types of filters (sediment, redox, pathogen etc) which are classified primarily according to the range of pollutants that they trap.

2. Reverse Osmosis (RO) units: This water purification technology works by pushing with high pressure, water through a membrane. This membrane has pores large enough to allow passage of water molecules but too small for larger molecules of pollutants.

3. Distillers: In the case of this water purification technology, water is boiled, producing steam. The steam is cooled and condenses back to water. Any substances that do not evaporate are left behind in the boiling chamber.

4. Ultraviolet units: Ultraviolet (UV) radiation is known to be effective in killing bacteria and other pathogens. It is worth mentioning that UV purifiers are made for the specific purpose of disinfecting water and are not effective in removing other pollutants. Therefore, it should always be combined with other methods of water purification.

5. Combinations of technologies: As you understand, every water purification technology mentioned back has its merits and drawbacks. What some manufacturers do is to combine different methods of water purifications into multi stage systems. In this way, they extend the range of pollutants that they can get rid of.

As for criteria that you should base your choice of water purification technology on, here is what I recommend:

1. Performance: This is measured by the ratio of output volume of clean water in terms of the input water as well as by the speed of the process, i.e. how long it takes to produce one gallon of water.

By comparing the different methods of water purification, both RO and distillers have very slow processes (for RO it typically takes two to three hours to produce one gallon of water).

RO also wastes a lot of water. It typically takes between 3 to 10 gallons of tap water to produce 1 gallon of purified water; the remainder drains away.

2. Overall cost (initial cost plus cost of ownership): As for initial cost, there is a large variation, depending on many factors such as the type of water purification technology employed (or a combination), whether you will install it yourself or someone else, etc. Prices might range from $25 for a single carbon filter and might go as high as $1,000 for a 3 stage combination system.

What is also important to know is its ongoing cost. This is measured in cost per gallon of water and includes replacement filters or cartridges as well as other costs such as electrical power bills, water bills etc.

3. Quality of water: This is measured in terms of the range of pollutants that are removed as well as by the taste and look of the water. In order to be better informed, it is essential that you have made your research beforehand, on what’s contained in the water that you are getting in your house. Get hold of the annual report of your public utility, or get a comprehensive report from a private laboratory.

4. Practical aspects: These include maintenance required (how frequently you have to change the filters), as well as capacity issues, such as whether it needs a tank (RO and distillers do), ease of installation etc.

As you understand, selecting a water purification technology that is tailored to your individual needs requires serious consideration on your part and the key to the best possible decision is access to objective information.

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Fresh water is essential to our health and comfort. Not only do we rely on it to stay hydrated, we use it in many other ways including bathing, cleaning and cooking food, and laundering our clothes. Fresh water has long been a concern of both public communities and private individuals, and several different water purification systems and treatment technologies have been developed to help ensure that tap water is safe for human consumption. But how do these different technologies compare?

Whether you get your water from a well or a city system, water sources can become contaminated by bacteria, runoff, and improper treatment. Even if water isn’t contaminated, it may contain iron and other hard minerals that cause discoloration and can build up in the body, or chlorine that leaves an unpleasant odor and taste. Consequently, many people choose to treat or filter their water to improve flavor and protect against contaminants.

Chlorine is commonly used by municipal water treatment plants and is effective in killing many different bacteria. However, it is not effective against some organisms such as Cryposporidium and Giardia. Both of these organisms can be found in lakes, rivers, and ground water and can cause serious intestinal illness.

As mentioned, many people feel that chlorine leaves an unpleasant taste and smell. In addition, there have been numerous cases where the city water supply became contaminated despite the fact that it was treated. People with city water supplies often use other water purifiers and home water filters to ensure that their water is pure and tastes good. The three most common options are carbon filters, reverse osmosis water filters, and ultraviolet light water purification.

Each of these technologies uses a different approach to treat water, and they each have different levels of effectiveness against various contaminants. One may work well to remove chemicals but be completely ineffective against bacteria, and vice versa.

In reality, there is no single filter or treatment that will eliminate every contaminant from your water. The best approach is to have your water tested for contaminants and then purchase a home water purifier that guards against the particular contaminants that cause you concern.

Another option is to combine treatment technologies. Most higher-end systems use a combination of carbon filters and one of the other treatment technologies to achieve the best results. Let’s look at the different technologies to see where each is effective.

Carbon Filters

Carbon is one of the most powerful absorbents available and it has been used for many years as a means of removing impurities. The absorbing powers of carbon can be further enhanced by adding a slightly positive electrical charge. This is known as activated carbon, and it is used in many standard home water filters. As the water passes over the positively charged carbon, the negative ions of the contaminants are drawn to the surface of the carbon granules and removed from the water.

Activated carbon filters typically use granular activated carbon (GAC) or powdered block carbon. Both work well for filtering and purifying but carbon block filters have been shown to remove more contaminants. Either type of activated carbon filters help reduce or remove a wide variety of contaminants, including:

• volatile organic chemicals (VOCs)
• pesticides and herbicides
• chlorine, radon, and other chemicals often found in tap water.

However, unless they are densely compacted, most carbon block filters are not effective at removing heavy metals or bacteria. For this reason, many people consider combining carbon filters with one of the other types of water purification systems.

Reverse Osmosis Water Filters

Reverse osmosis, also known as hyperfiltration or ultra-filtration, was developed with U.S. government funding as a means of desalinating ocean water. A reverse osmosis water purifier uses a semi-permeable membrane that allows pure water to pass through it, while contaminants are trapped by the tiny pores in the membrane.

The process requires that the water be pressurized to help force it through the membrane. Most standard residential water systems have sufficient pressure. Like activated carbon filters, reverse osmosis also uses charged particles to help filter out impurities.

The effectiveness of a reverse osmosis water purifier depends on the density of the membrane. A membrane with larger pores will obviously let larger impurities pass through. It is also important that the membrane be cleaned regularly for proper functioning.

Higher quality reverse osmosis water filters use a process known as crossflow to allow the membrane to continually clean itself. Crossflow directs some of the water downstream from the membrane, sweeping the rejected contaminants away so they do not build up and block the membrane.

There are two types of membranes commonly used in reverse osmosis water filters –Thin Film Composite (TFC) and Cellulose Triacetate (CTA). TFC membranes are noticeably more effective the CTA membranes but they tend to be less resistant to the deteriorating effects of chlorine. This problem can be avoided by using an activated carbon pre-filter to remove the chlorine first.
Reverse osmosis water purifiers come in different sizes and styles including countertop and whole house water purification systems. They are capable of filtering out a long list of contaminants including:

• chlorine and other treatment related products
• bacteria
• salts, sugars, proteins
• dyes
• heavy metals

One drawback of reverse osmosis water filters is that they are more expensive than carbon filter treatment systems. Also, the purification process is usually somewhat slow due to the use of pressurized water. It can take an entire day to produce 15 gallons of purified water. And a typical reverse osmosis water purifier may need up to 8 gallons of untreated water to generate a single gallon of purified water.

UV Water Purification

As the name implies, ultraviolet light water purification systems use ultraviolet (UV) light to treat water and render microorganisms harmless. The UV light comes from a high intensity lamp that is usually enclosed in a protective quartz sleeve. When water passes through the water treatment system, the UV light damages the structure of any organisms and makes them sterile.

Although a UV water purifier requires electricity to operate, it draws about the same amount of energy as a light bulb. However, the lamp bulb itself needs to be replaced every year to ensure adequate intensity.

While whole house UV water purification systems are effective on most bacteria, viruses, molds, algae and other organisms, they do not remove chlorine, heavy metals, VOCs, or other chemicals. And countertop UV systems, which expose the water to UV lighting for less time, do not always remove all organisms.

UV water purifiers average around $700 for a whole house system, making them more expensive initially than other types of treatments. In addition, without a pre-filter system, contaminants can build up and reduce the intensity of the UV lamp. For these reasons, many people combine UV water purification systems with carbon filters, which also increases the costs.

As you can see, each of the three common water purification systems has its advantages and drawbacks. Deciding which is best depends on your budget and the type of water contaminants you want to remove or prevent. A test of your tap water will help you determine the appropriate water filtration system for your needs.

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Why is residential water purification necessary and what is it?

Simply put water purification is the process by which water that is contaminated and dirty becomes fresh, clean, and healthy for humans to consume and use in everyday life.

What has happened to our system?

It is a sad fact that this basic resource can no longer be guaranteed to us. This resource is necessary to our existence. Contaminated water is no longer a third world problem. In fact, it is even harder to locate particularly in industrialized countries. It is one of the most important requirements for our bodies.

According to research , most water in the U.S. now isn’t good for drinking. We have reached a point where every source has some form of contamination. Pollutants range from naturally-occurring minerals to synthetic chemicals and by-products.

Low exposure to a lot of basic pollutions will, over time, cause dangerous illness including liver damage, cancer, and additional dangerous ailments. Even the chemicals usually used to treat our domestic supplies such as chlorine and fluoride are harmful and are acknowledged to cause substantial detrimental effects on humans.

All water entering our homes should go through various stages of filtration and purification. The first of these is at the municipal treatment plant. Here many contaminants are removed after the water is treated with various chemicals including chlorine.

It then travels through pipes to it’s eventual destination - our home. Quite often these pipes were laid many years ago and are rusting which in itself is another form of contamination. Once the water enters our home it is now our responsibility to protect ourselves and our loved ones by installing some form of residential water purification.

We may elect to go with a whole house purification system which as the name implies treats the water for the whole house. There are also countertop and undersink units available which will treat an individual tap. Shower and bath filters are also becoming very popular.

Maintaining these residential water purification systems is essential but not complicated. The main thing is to replace the cartridges or filters as per the manufacturer’s guidelines. After installing one type or another of water filtration system, you will undoubtedly find that the water you will be drinking will be odor-free and have a fresh clean taste.

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