It is not surprising to find reverse osmosis in use far more often in countries where the tap water is generally considered not potable. It makes sense that if you can’t drink it, your plants, that are dependant on you for their entire ecosystem, probably can’t drink it either.
If you live in a country where you can fearlessly drink the tap water without fear of any kind of infection or poisoning you may rest assured that your plants will be able to drink it as well.
Reverse osmosis is a filtration method that can remove up to 95-99% of dissolved salts in any water sample. It is the preferred method for desalinating water on an industrial scale for manufacturing and domestic water supply.
The resulting ultra filtered water is stripped of all minerals. You are now responsible for the entire mineral profile of your water before it goes to your precious plants.
Straight up reverse osmosis water will deplete your plants of calcium and magnesium so fast your head will spin. People that drink pure RO water are similarly at risk of osteo-type deficiencies and poor teeth because reverse osmosis water can pull calcium from the body.
Your nutrient product should be selected with the use of reverse osmosis water in mind. Remember you are now entirely responsible for the mineral content of your water. Organic soil growers will still need to modify their water. Soil is an excellent buffer against ph fluctuations and microbial attacks, but it will not save you from calcium deficiency. At all times, from spray bottle to the final flush stages, the reverse osmosis water will always need to be adjusted.
Do you use Reverse Osmosis and what is your Experience?