I'm using Biobizz biogrow and biobloom, latest dosage was about 1 ml/l biogrow and 1ml/l biobloom
But when I have flushed 3xpot size or more with water regulated to a ph of 6.3-6.4 it's still almost impossible to get the runoff ph down to less than 6.7. But the soils ph is according to manufacturer 6.3-6.6, so can that might be the reason it will be hard getting it much lower than 6.7 for me? Another problem with the flushing is that I didn't have any ph-down for the bloom phase and have been using vinegar or concentrated lemon juice to adjust, and they maybe isn't too stabil and will easily allow the ph to rise? But I have gotten my hands on some phosporic ph-down for the flowering phase.
about the feeding and frequenzy, I have been using 1ml/l (equals about 4ml/gallon) through the last 1½ months of veg with every watering more or less. And then when I started flowering a month ago I started using biobloom at the same time, used it for about the first 1½ of flowering at a dosage of 1ml/ll(4ml/gallon), every watering.
But you ask off how I test the ph, yes I'm letting the pots stand and drip from the bottom into clean cups and then testing the runoff with a ph-pen(calibrated before every watering/measuring almost, quite stabil readings)
About the larva in the soil, I noticed them once when flushing 2 days ago, but the roots have always looked white and healthy, I used neem oil mixed into thewater used to flush, not in big dosages, but I haven't observed more larva since then(but the larva is most visible when ther's water in the top layer of soil, and that there haven't been for the last 2-3 days)