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Apr 3, 2018 at 23:24 comment added stormy George of all trades let's talk about fluoride. It is not sodium fluoride, right? It is Hydrofluorosilicic acid PLUS...right? How tough is it to distill water and will that get rid of hydrofluorosilicic acid, sodium hypochlorite? How much buffering does decomposed organic matter do for soil pH?
Apr 3, 2018 at 7:43 comment added George of all trades It won't be treated which means that sodium hypochlorite (some parts of the world still use chlorine, but most treatment plants don't because it's a lot easier to get wrong) and sodium fluoride (if your local water supply is fluorinated) will not be present. This means that there will be fewer sodium ions and fewer halide ions present. This can be beneficial for particularly sensitive plants. Of course if you live anywhere near the sea then the effects of salt spray will completely eliminate any such advantage
Apr 3, 2018 at 7:42 comment added George of all trades The advantage of rainwater is really going to depend on what you are growing and where you are: one of the main reasons for using it is that it will have a lower pH than groundwater in a 'hard' water area and so is better for water calcifuges (lime-hating) plants.
Apr 3, 2018 at 7:37 comment added George of all trades CO2 will come out of solution if the partial pressure of CO2 in the atmosphere is reduced, however, I can't image that there is likely to be a significant difference. The effect of SO2 and NO is much more permanent so I can't see how that would change on standing.
Apr 3, 2018 at 6:01 comment added Graham Chiu SO2 and NO acidify rain water along with CO2. Not sure why acidity would be lost either unless it's being neutralised by all the bugs falling into it!
Apr 2, 2018 at 21:17 comment added stormy CO2 is not an airborne contaminate. Heavy metals are.
Apr 2, 2018 at 20:52 comment added Graham Chiu Gathering air borne contaminates acidifies the water. Sitting will lose some of the CO2?
Apr 2, 2018 at 20:35 comment added stormy How does rainwater lose its acidity sitting in a barrel? Don't think pressure coming off a roof is even noticeable. Rainwater is tons better than tap water tell everyone why, please.
Apr 2, 2018 at 20:31 comment added Bort I'll have to look into the diverter. If water backs up at the gutter, then it would just be how it is already (water runs off the end).
Apr 2, 2018 at 20:14 history answered Tim Nevins CC BY-SA 3.0