Personally I haven't been able to tell the difference between K-lite and grow more 30-10-10. I used both at 1/4 tsp per gal with the exception of cattleya's and encyclias which had blackening new growths due to calcium deficiency I had good growth with both. I use tap water (seattle has very pure tap H2O), add a few drops of dechlorinator and 1/4 tsp of RO K-Lite. I try to do kelp every other week at 1tsp/gal. Oncidiums and cattleya's seem to respond well to what I'm doing. K-lite seems to work well with my succulents planted in fairly inert media. Only reason I'm using K-lite is because its a good calcium source and mixed with my tap water it ends up at a perfect pH for me (6.0).
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