I am a long term Green Jungle (Orchids Limited) user alternating with K-Lite. The formula is mandated to be rounded so the zero isn't really zero and the 1s aren't exactly one. However, using the exact formula for the fertilizer, 2 tablespoons of Green Jungle per gallon of water will be 100 ppm N. Green Jungle is a very carefully created complete fertilizer with more things in it than are on the label. I know it is more expensive than some others, but I have had success with it. This is the fertilizer that Orchids Limited uses on all of their orchids.
Using the 7% N fertilizer solution, you would use 1 teaspoon per gallon to get to 100 ppm N. 100 ppm would be acceptable for many orchids, depending on other growing conditions. Some excellent growers use less and some use more.
With a good desktop reverse osmosis filter and a good TDS meter I get about 3 ppm which translates to an EC of about 0.06 (omitting the units) confirmed by calibration solutions. My tap water is around 80-100 ppm where I live. Apparently, your distilled water isn't quite as "pure" as standard RO water.
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