Multimedia Carbon block technology is also effective in removing synthetic chemicals such as herbicides, pesticides and common pharmaceuticals that are now being found in our water supply. Reverse Osmosis, another one of the popular types of home water filter and filters, is ineffective in removing these types of compounds. It is often recommended that one use a carbon block filter in addition to the reverse osmosis filter.
There are only two type of home water filter systems that will remove bacteria and viruses: distillation and ultraviolet light. Distillation is not effective in removing VOC's or many other chemicals. Neither will Ultraviolet light systems remove any of the chemical contaminants.
Home made RO water vending station instructions you'll find online are complex. They are often simple filters, but they are often more complex systems such as distillation. Still, there are some serious problems with the do-it-yourself approach to water filtration. Improperly filtered water can be a health hazard. It is worth of praise and understandable that you wish to save money by making your own filters, but you should recognize that if you do, you may spend just as much money as you otherwise would while also putting yourself and your family at risk. 
400G/800G/1200G RO water ...
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First, home made water purifiers generally don't tell you when they can no longer remove contaminants. Most professional grade water purifiers have some system whereby they will tell you to change filters or clean the purifier. Except for distilled water, you should assume that your home made water filter will need to be replaced, so you have to determine what the maximum safe use time for it is yourself. If you don't change the filter when it's saturated with contaminants, the result could be worse than if you used no filter, as fresh water running through will dissolve some of the contaminants already in the filter and give you a double dose.
In many ways, people are to blame, not just government and industry. The drugs and hormones are our fault. We dump things down the drain without thinking. If commercial water vending machine goes down the drain, it goes back to the water treatment facility and eventually ends up back in the tap water. You could say that we caused our own need for an in home water filter system.
