by 
The Curious Bag
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<h4 class="dechead">On One Hand: Using Tap Water
In most cities, tap water contains generally the same amount of nutrients and is of as good a quality as spring water; therefore, plants will grow as quickly in tap water as spring. However, certain areas contain tap water of lesser quality that will keep plants alive but stunt their growth.
On the Other: Using Spring Water
No matter the city you live in, spring water will always be as good or better than tap water. Because the water is coming directly from an underground source, it will contain many more nutrients for the plant to absorb. Those nutrients will help the plant grow taller and quicker.
Bottom Line
In most cases, tap water and spring water will have the same effect, but if you live in an area with poor tap water, your plant will grow taller in the spring water. Spring water is never going to be less effective than tap water, so if you're unsure of your tap water's quality, your best bet is to take the safe route and use spring water.
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