The New York Times has an article about self-cleaning pools for the backyard that use no chlorine. Invented in Europe these pools meet strict EU water quality standards. From the article:
- The pools have skimmers and pumps that circulate the water through the regeneration zone and draw it across a wall of rocks, loose gravel or tiles, to which friendly bacteria attach, serving as an additional biological filter. Unlike artificial ponds, which tend to be as murky with groundwater runoff and sediment from soil erosion as the natural ponds they’re modeled on, in a natural pool the water is clear enough to see through to the bottom. [Link]
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