Any natural setup using sand, rocks, charcoal that makes it more economical than store bought filters? And, how much of the impurities do they actually take out.
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But there are minerals in the dirt they sit in, no?
Depending on where they’re planted. I’ve just watched videos on different types of water used to grow things. Things will still grow with the reverse osmosis water, but not as hearty or as beautiful. They still need those minerals. Even the land itself needs to be given a break from time to time for the minerals to build back up. If you’re using potting soil, I’m not sure how often you’d have to change that out. But Tap water or hose water is perfect for watering plants.
But isn't rainwater and RO water essentially the same mineral-wise since rain is created through evaporation (distillation)?
Reverse osmosis is a system that cleans the water. It removes all the minerals and removes everything so it’s clean pure water.
https://www.iwapublishing.com/news/reverse-osmosis-and-removal-minerals-drinking-water
It’s recommended that you have a mineral supplement, or get your minerals from the food that you eat. If you’re eating healthy you should be able to do that, but if you’re not you should have a mineral supplement if you have a oral system in your home.
As I have said before, I don’t recommend watering your plants with the RO water. There’s no nutrients in that water for them at all whatsoever. Yes they will grow, because it’s water. But the water from your tap or hose is what’s best for your plants because it has the minerals that they need.
I just don't understand how rainwater is much different from RO water since evaporation removes all nutrients from water as well. I'm no expert, but plants seem to grow OK with rainwater, but you say there needs to be nutrients in the water for plants to thrive.