Please choose the correct ending to complete the given sentence: Home and Garden: [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.

Ending1: [step] In most kitchens, water consumption is between 6 and 13 cups. Sinks have nitrates hydrogenated in the water, so it is considered a conservation deficiency if your appliance may not come with an under the sink water filter. Ending2: [step] Different filters function and interact differently than regular water. [substeps] Sometimes they actually water much differently than ordinary garden water. Ending3: [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. Ending4: [step] Water composition on a set of toilets, sinks, and faucets can add up to a huge difference. Be sure to make a lot of extra room-add panels or outlets where necessary, or something like a rail that closes a toilet, ceiling panel, or tub.

Answer format: ending1/ending2/ending3/ending4