What is the purpose of the pre-flush other then perhaps clearing debris?
My two cents: typically the first water washed / flushed from a catchment system / roof is loaded with settled dust, insects, bird poop, miscellaneaous organic material, and pollution particles that you do not want to drink. Rather than overburden and possibly clog a filtration system with the initial dirty water load, you let it drain or flush away for a while before the presumably cleaner water is captured.
Exactly. It reduces the effort of purification later on.
-Blast
Ok, I had thought the purpose of the water barrels would be for lawn, garden watering etc. I did not think that the water in the barrels would be for drinking. My main concern would be the leaching of the chemicals in the roofing materials such as the petro-chemicals used in most asphalt shingles. How would you filter this out and make the water safer for drinking?
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.
John Lubbock
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