 Water efficiency and rainwater harvesting, eco housing very often does have applications of collecting rainwater from the roof and in the video with Reynolds you saw that he is promoting using only rainwater and that's something what I absolutely disagree because I think we should infiltrate the rainwater into the ground and use good groundwater because we need the filtration like the rainwater has a lot of substances that we don't want and the aquifer is the best storage so if you have seasonal rainfalls and you fill up the aquifer over the more rainy part of the year you have a water storage that is very long lasting that has cold temperature that is filtered protected against bacteria and so on and you can always take it out fresh at a reasonable temperature so in my point of view the best choice for rainwater harvesting is groundwater recharge with rainwater infiltration and then having a well on site and maybe some treatment for the water that you want to use for cooking drinking and so on but of course cisterns do make sense for like gardening and so on so it's it's never black and white it's it's often there are downsides there are upsides and it's the choice that you make that's the engineering part of it to choose between different options and find out a good balance between the upsides and downsides but the strange thing is that rainwater harvesting is very often driven by companies that are selling you cisterns or pumps or machinery so for them it's not very interesting when you just infiltrate the groundwater and have your own well because they can't sell you big cisterns so the companies are driving you into something what is not because it's the best choice but because they can sell their products what is completely okay but you are the one to decide okay for this site this doesn't make sense we make something that is rather well using the aquifer instead of a big tank