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Thanks ALGA... that's a great start to figuring out the cost/benefit of doing some such system. I suppose the offsetting costs from not using city water and sewer would have to be significant engough (use the water from run off and have it rain often enough to replenish it) so that the money saved on the system can offset the installation cost. I suspect that it would take quite some time (10 years?) to offset the initial cost depending on size of tank and how much water is saved. I suppose for grins and giggles you'd have to install a water meter on the outbound side of the tank so you could quantify savings.
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