Sorry about that. I believe it would be about 2tsp per-gallon, but I measure it in a measuring cup in oz. The .9 would be 5tsp. I have not added anything extra yet, if I do I will be using less. The plain water is 218ppm (hard water). There is a lot of iron in our water, enough where we are changing our water filter weekly because it's so bad.
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A NFT system uses a "thin" layer of water running at the bottom of the trough. If the water level is much higher than that, you run the risk suffocating the roots. They need air/oxygen just as much as water.
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Oops. I've been running it the whole time with the pipe a little over half way filled. I've reduced it now.