Well, if you are using soil. With nutrients like that (base nutrients) with soil it lasts longer in the soil, so once or twice a week max at 2ml/l or less depending on how many different nutrients you are using and the ppm/ec of course. If you are using coco you want to make up a mix and feed her a little every day, with coco you will need to give most of your nutrients every day. It should say, if using coco every day or soil once or twice a week.. You won't need as much say if you are giving a 1 or twice a week feed with soil, a 500ml feed once or twice a week with soil is fine be sure to follow up with soft water flushes (no run off) with coco you wanna be feeding every day and doing a hard flush, (with lots of run off) to wash away any salts, as coco is inert it doesn't get toxic as quick as coco. Feel free to DM me. Idk about the PH of that. I use a similar product, well similar line, biocanna rhizotonic and the PH is crazy. Idk what PH that stuff holds but I do know them nutrients are organic and you can get away with using more than synthetic nutrients. Just be mindful of the ppm and how you get there with what you have.
Happy growing.