Best Faucet Filter...
The best water filter for your kitchen or RV tap, is the one that removes the most harmful contaminants in our water 
supply.
If you don't like the taste of your tap water, due to contaminants e.g. Chlorine, Agricultural Pollutants, Lead, Rust, Microbial Cysts, a home water filter can positively help!
Points to consider when buying a Faucet Filter
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Get a water-contaminant report from your local water utility.
Ask your local Municipality for a Drinking Water Contaminant Analysis Report. This will tell you what's in your drinking water. You can also go to the EPA website makes these reports available.
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How much tap water do you use?
Families quickly grow tired of refilling pitchers. You will be better with a faucet-mount or under-sink system.
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Are replacement filters are easily available?
One reason to go with a well-known brand is easy access to replacement filters, Pitcher and faucet-mount filters must be changed every one to six months.
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Consider long-term costs.
The initial cost of the faucet filter, and subsequent replacement filters should be a consideration. Having to replace a filter every six months as opposed to monthly may cost less in the long term once you take the cost of replacement filters into account.
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Can the faucet filter be upgraded?
After purchasing a pitcher or faucet-mount filter can the unit be upgraded to an under-sink unit? Eventually you may want to purchase an under-counter unit or whole house unit.