Filter Ultra Violet

Filter Ultra Violet

House Water Filters - How to Choose the Best Water Purifier?

Many people are looking for house water filters and for a good reason -- plainly said our tap water is not always safe to drink. Surely, it has been purified, but usually this water purification process is not enough to remove such dangerous things as bacteria, radio nuclides, metals and traces of pesticides and herbicides, which are often found in ordinary household tap water. Having a house water purification system will help you to ensure that water you and your family drinks is healthy and clean, but which type of filter is right for you?

Most effective types of home water purifiers

The most popular water filters are carbon water filters also called charcoal filters. They are made from coconut husk. This type of filter is pretty good - it removes most dangerous water impurities, but allows minerals that are beneficial to our health to pass. Carbon filters are not expensive, and a single cartridge lasts 6-9 month.

However, carbon water purifiers have some disadvantages. First, they can't change the pH of your water, so if you know that the water in your aria is acidic, you might need another type of filter - simple carbon one won't fix the problem. Another problem is, that if the filter was unused for several days it starts getting moldy, especially in hot summer month. If you feel that your filtered water tastes moldy, change the cartridge.

Reverse Osmosis water Filters - More sophisticated technology

This type of water purifier was developed for use in submarines to turn salty sea water into drinking water. But it does more that that - as water passes through a very fine membrane, most contaminants are removed. Reverse Osmosis water purifiers do their job extremely well, sometimes a bit too well. They remove every mineral, leaving just pure distilled water and as some researchers discovered distilled water is not the best thing for our health ether - our bodies need many minerals that usually come with hard (not purified) water.

UV water filters effectively kill all bacteria

Ultra Violet water filtration systems are a comparatively recent invention. As high frequency light passes through the water, it effectively kills all microorganisms. So UV filters are great for getting rid of bacteria, but they don't remove any dangerous minerals. They are often used in hotels in countries, where the risk of contaminated water is high.

There are more water purification methods including magnetic systems, energetic water treatments, far infra red systems and water ionizers. They all are effective to a certain degree, but some of them are still experimental and are not yet used for house water purification.

Variety of home water filters on the market - which filter to buy?

There are many options, you can chose from:

- Undersink Filters
- Countertop Filters
- Tap water filters
- Shower Filters
- Whole house water purifiers

The easiest solution is getting a countertop filter. They are easy to install and portable, if you are planning to move. Tap water filter is another inexpensive option that produces good results.

However, if you live in an aria, where water is generally low quality, you might want to go for a whole house water purification system. Surely, this will cost you more, but you will get clear water for all your household needs. Most whole house water filtration systems are of Reverse Osmosis type and they do the job pretty well.

About the Author

Visit Water Filters Central for detailed information about all types of house water purifiers and of most effective water filters reviews

camera filter question - what are some good filters to get for a canon 30d for someone who is just learning. .?

to use her first slr camera? I mainly take landscapes in both bw & color, some portrait - both indoor and outdoor, and macro indoor and outdoor.
Is a B W 19mm UV (Ultra Violet) Haze Glass Filter #010 something that should be used when shooting outdoors at all times?
thanks!

All you really need is a UV or Skylight 1A (uncoated) or 1B (coated) filter to protect the front element of your lens and a circular polarizer.

Although someone may tell you to not use a UV or Skylight filter, I'll tell you to use one based on the 37 years I've been using them. I've never had any problems with image degradation from either of them. I have lenses that are well over 30 years old and their front elements are still perfect. Many years ago I was at a street fair with my (then) new 85mm f1.7 lens. A child with who knows what on his fingers left some nasty smudges on the UV filter. I'd much rather sacrifice a filter than a lens. Remove the UV or Skylight filter when using your polarizer.

A circular polarizer is used to darken a blue sky and to remove glare/reflections from glass, water, snow, sand, shiny leaves and painted metal - but not polished metal. It also enhances colors.

Do NOT waste your money on cheap filters. Choose from Heliopan, Hoya, B+W, Singh-Ray, Tiffen. I use a 35 year old Tiffen polarizer so the old adage "Quality doesn't cost, it pays" is true.

When buying filters to be used on a wide angle lens (18mm, 14mm etc.) buy the "thin" or "slim" mount versions to prevent vignetting -darkening of the corners of your image.

For the best possible landscapes, have your camera on a tripod. Use your camera's highest resolution (3504 x 2336) and lowest ISO (100).
Shoot in Av (Aperture Priority AE) at your smallest f-stop (16, 22, whatever it is), let the camera set a shutter speed, and use the camera's self timer to release the shutter. Of course you should be using your polarizer.

If you'd like to know how to calculate Depth of Field (DOF, loosely defined as that area of acceptable focus in front of and behind your subject), go here: http://www.dofmaster.com/dofjs.html

If you're using an 18mm lens at f16 and focused to 4 feet your DOF will be from 1' 8" to infinity. Use a 55mm lens under the same conditions and your DOF is from 3' 7" to ~ 4' 7".

Photography with Imre Z. Balint: Episode 8 - UV Filters

67mm Ultraviolet UV(0) Haze Multicoated Filter
List Price: ~~$37.35~~
Sale Price: $26.00
You save: $11.35 (30%)

Eligible for free shipping!
Availability: Usually ships in 2-3 business days

Vivitar VIV-UV-77 Ultra Violet Lens Filter
List Price: ~~$19.99~~
Sale Price: $4.69
You save: $15.30 (77%)