While shopping for under sink water filter systems, it would be wise for a consumer to pay attention to certain features of these filter systems. Firstly, the under sink water filter cartridge should be competitively priced in comparison to the price of other filter systems, for example, refrigerator type filters. A consumer can expect to pay about thirty dollars for an under sink water filter cartridge, which is similar to the price of those of other filter systems. The cost of using an under sink water filter system, as opposed to a bottled water system, are considerably lower, as the cost for filtered water is only about six dollars per month, while a bottled water system usually costs over twenty dollars a month (assuming a usage rate of one case each week).

Every component that is required for installation is included in the best under sink water filter systems. Such a system will also include all the components required to connect the system to the under sink pipes. Detailed instructions are standard with any of the best under sink water filter systems, meaning that anyone given the right wrench can install the system with ease. So as to allow efficient use of the filtered water, an extra separate faucet for filtered water is also included in the system. By allowing a user to have a choice of filtered or unfiltered water, water is conserved efficiently because filtered water can be used solely for consumption purposes and not on purposes such as washing dishes, where it is not necessary to use filtered water.

The water filtration capability of the best under sink water filter systems are commonly backed by guarantees. There are, for instance, some filter manufacturers who guarantee near perfect filtration rates of cysts land lead from the water supply. Cysts in drinking water, such as Giardia, can lead to illness if drunk. The filter must also remove the chlorine taste and odor in tap water, so as to make it as pure as possible to consume. Subsequently, harmful chemicals and heavy metals like mercury, as well as herbicides and pesticides that sometimes seep into the water supply near farms should also be removed by these water filters.

Should a filter change be in order, a monitor which is present in many of the best under sink water filter systems alerts a user to change the filter. This intelligent design feature helps a user remember to change the filter every half year; a task that can so easily be forgotten in the hustle and bustle of life.