Remedial water system was created because before the system we now use, there was a problem with sediment building up in drains and so that meant every year the whole underground water system would be flushed. If the whole system would be flushed annually that meant a bunch of water would be lost and that is very costly in many ways. Now we have the system were the water is recycled to let the sediment out but not waste the water at the same time.
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http://www.patentstorm.us/patents/6627089-description.html
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