Hello All,
           Tinkering about and found my previous reply on this thread. Last Summer (2009) the same guy, who is really nice and also delivers large loads of gravel charged 110e for a fill of 6500ltrs- 2 cubos, cisterna and kiddies pool- all with potable water.He charges 140e for gravel (6ton  load) and can make it as fine or course a grade as you need.
                                                                 briand