You still didn't say what standard of measurement you're using ppm or Ec....The strength of your feed should be determined by the background Ec of your source water and the stage of growth the plants are at. Never use the ml per litre recommendations sometimes stated on feed bottles they are too general and very often inaccurate...30 liters of coco would require a volume of water/feed solution of around 4~5 litres each per day...
Regards BL
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