I use b52 all the week into flowering and grow except when I give the microbes. I have the nuts burn because u should use 1/2 maximum of all nutrient lineup! If your tap water comes with high residue you should drop yet to 1/4 to 1/2 👌🏼 Hope to solve your question, if u have other doubt tells us. And sorry for my bad english maybe✌️🏽😂🙈