Guy Posted May 1, 2017 Report Share Posted May 1, 2017 Having just bought a TDS tester pen some interesting readings have come to light. De ionised water 3ppm Reverse osmosis water 13ppm Rain water 77ppm. Does this mean De ionised and RO water are better for CPs than rainwater? Guy Quote Link to comment Share on other sites More sharing options...
Bluedog0628 Posted May 1, 2017 Report Share Posted May 1, 2017 Maybe but I'd use rainwater whenever possible. It's the most natural water you can get and in the wild, CPs do just fine...No need to mollycoddle the plants, I haven't heard of anyone loosing a plant due to rainwater use. Plus, rainwater is free... Why spend money on RO/deionised water when you don't have too? If you have a small collection and a water butt, it should be enough. If you have lots of plants you might consider other options (or at least have a back up plan in case your rain water butt runs dry). Quote Link to comment Share on other sites More sharing options...
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