When my high school chum moved to the southern part of Metro Manila, they had to have water delivered because there was no water system in their area. And instead of spending 1,000 pesos a month for water delivery, she spent 70,000 to have an artesian well that would give them free water for lifetime. In a simple computation, the cost of that artesian well is equivalent to 70 months of their water delivery expenses. However, she did not add the cost of the pump that uses electricity. But in fairness to her, she had saved money in a span of 10 years or 120 months of free water.