Distillers will heat the water and are still very expensive. Then you have a reverse osmosis system, which uses pressure to push water through filters, but these are very wasteful. Then you have systems that use ultraviolet light, but these only work on living contaminants. The better system of all of these is the last one, which is a carbon/ceramic system. This filters water in a 2-step process.
You can have your water tested to see if you have need of one of these systems, but it really isn't needed. This test can cost anywhere from 20 dollars to 200 dollars. There are many on the market today so just be careful when buying any of these products.
The most popular kinds are systems that you put on your faucets in your kitchen, and there are many to choose from in many different styles. Before you buy, make sure that it will fit on your faucet because for some, you might have to change the style of your faucet to have it fit. You can also find sport bottles with filters for your travel needs because it's a friendly alternative to bottled water. There are also ones that you can install in your bathroom, and these help with the benefits of softer skin and having it less dry to your hair being less brittle.
You want a purification system that includes carbon granules, multi-media blocks, sub-micron filtration and ion exchange. If you really want a good system before you buy, look at all the types that are on the market and read the labels that will be on all the different systems, and then buy. If you have a lot of people in your household and you have a lot of sinks, you might want to look into a bigger system. This might be more expensive, but in the long run it might pay for itself because you won't have to change the filters so often. Over time this way can become very expensive and time consuming. This bigger system will pay for itself by a couple of years because of this reason alone. In this time of crisis in our country today, we need to make sure that we do everything possible to protect our families.