We have a cisterna in Spain too. The water is used for showers,washing machine and washing up. I buy bottled for drinking. I haven't got a green genie but add Growing Success Natures Disinfectant to the water there although my Spanish neighbour tells me I don't need to as he's been using the water for 60 years with no ill effect. It does stay very cool underground though. I think our water butts here probably do get a little stagnent. I always use water from the tap for the girls but if it rains they prefer a nice muddy puddle. I've noticed cats and dogs do too, so perhaps they know something we don't.
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