I found WW to burn very easily....kinda picky for a plant so just go real easy on the nutes. I use GH 3 part....My plants burnt around 1000 ppm that's with 170 ppm tap water. Lower the GH general dose my 20% or so and they do good...just up it until they show small signs of nute burn then back off a bit and there ya go. One of my plants was much more sensitive than the other as well so keep that in mind.