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Thanks dear d'or tour point of view as answer to your troubles i can mention that:
-Solar pump is not too expensive, i used to use it un lot of my project in our country and it work wery good and concerning the maintenance of pump it will probably begin at least six year after installation. I mention a tank that will allow to reduice the working time of the pump and give to the pump the best lifetime
-Concerning the ground water, un our country generaly in Africain we have not the problem of contamination of ground water by non biological contaminantes because we scarcely used them in our agriculture system and we bore at least at 70 meter
Our geological configuration is so exceptional
So ground water is clean and naturel than surface water even if we put any artificiel technicals to treat it
Best regard