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Using tap water for your garden, especially your food garden, can have some negative results. Many times, gardeners are forced to use the tap instead of catching rainwater due to their growing conditions, regulations on catching rain water, or inability to catch rainwater due to space available. This can lead to less than ideal crop returns and be frustrating. The chemicals used tend to kill some of the good along with the bad.
One gardener seeks to challenge the damage done to gardens by chlorine, instead citing that rainwater tends to have more nutrients such as nitrogen that has been gathered as it falls and that is what makes rainwater superior. Whatever you believe, there are ways to improve the tap water you may be forced to use for your garden. The addition of ascorbic acid (vitamin C) will not only neutralize the chlorine that may be present in your water, it will also affect chloramines (a combination of chlorine and ammonia) and render your water neutral almost instantly.
Just as important as the composition of your soil, the quality of the water you use in your garden should be known and monitored. Especially for those who cannot utilize a water catch system, having the knowledge will help your garden with healthier plants and larger harvests.