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http://www.thebackyardfarmer.net/ I present some bad news about the growbed I planned on using for duckweed and I walk you through a set of my chemistry test...
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In your video you showed pH about 7.6. According to AquaPonics Gardening it ought to be down around 6.8 to 7.0. The reason is to make as much nutrient available to plants and fish as possible, while allowing the bacteria to thrive. They each want a slightly different pH, but 6.8 seems to be a good compromise. Also, the plants like nitrate, rather than nitrite. If you don't already test for nitrate you may want to. You're looking for nitrates up in the 50 ppm range - or higher. Ammonia and nitrites should be zero. But as you mentioned, everyone's water might test somewhat differently. Just my two cents.
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