urghhh i'm holding my head in disbelief that i didn't look at BioBizz's website for their recommended schedule. i was way off! lucky i didn't kill the plant. Lesson learned, don't just wing it and hope for the best
Better news though, my city water has only 42/43ppm TDS or around 0.067 EC. I made a few measurements of 2 and 4 ml/l of the various nutrients i'm using in 1L of tap water, i honestly can't see why you would ever want to use 4ml per litre of BioGrow, that's dangerous stuff in the wrong hands
When i restart feeding later this week i'll be using (per litre) 1ml BioGrow, 3ml BioBloom & 1ml TopMax and sticking firmly to the recommendations from now on
BioGrow
2ml/L average TDS increase: 346 (0.541 EC)
4ml/L average TDS increase: 659 (1.03 EC)
BioBloom
2ml/L average TDS increase: 131 (0.205 EC)
4ml/L average TDS increase: 254 (0.397 EC)
TopMax
2ml/L average TDS increase: 4.3 (0.007 EC)
4ml/L average TDS increase: 9.3 (0.014 EC)
That's a one off test so the data isn't going to be entirely reliable, but hopefully serve as a rough approximation