Stand Alone Rainwater Harvesting System
Decreasing rain acidity?
by RainSaucers Inc. on October 3rd, 2011

One of the biggest takeaways from our recent attendance at the annual ARCSA (American Rainwater Catchment Association) is that while rain in the United States can be polluted in some places, it is generally stable thanks to legislation which has been capping emissions. Acid rain as the EPA likes to tell us is rain that has gone down the Ph scale from a normal 5.6 to something closer to 4 (see chart). The cause: atmospheric pollutants such as sulfur dioxide and nitrogen oxide. Acidity is not harmful in drinking water per se (after all soda has a ph of 3) but fish can't really survive. And we all knows what happens when the food chain starts to collapse. For this reason, the EPA has been monitoring the Ph of rainwater and it's also how we know Ph levels are starting to return to normal.

On a side note, we also received an answer to one of the questions we often ponder about rain acidity. Is there a way to decrease the acidity of rain, post-collection? The short answer: yes- limestone. Adding limestone to a tank in the right amounts can mimic the natural process which occurs in groundwater. Limestone BTW is also the key ingredient in those over the counter anti-acid meds because it is such a great acid reducer.

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