Wow - that seems very high! Not all PPM’s are the same. Most states have water testing labs that can tell you exactly what you have. Might be worth it to find yours and send them a sample.
BTW - I also use GLN’s Mega Crop, but I use their 2 part formula + their Bud Explosion in my hydro (ebb and flow) grows. I use RO water, though, and supplement that with CalMag Plus. My plants seem to like it…
