You may want to have look at ...

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You may want to have look at a South African product called Aqua Salveo. Go to http://www.gurumanzi.com and have a look at the info and references there. The product has been used in South America, where the pipes and canals feeding both in to and out of the water source were treated and where the quality of the water was improved to the point where the yields on the crops started to improve significantly Contact me for more info.