[header] How to choose an under the sink water filter [title] Make sure you have room under your sink for a filter. [step] The filter will attach to the pipes beneath the sink, so clear enough space to accommodate the filter system. [title] Understand your water composition. 
[step] Before you choose a filter, you will need to know what kind of impurities are present in your natural water supply. [substeps] Buy a do-it-yourself water testing kit to determine what you want to filter out of your water.