My well tests at 550 ppm’s, mostly calcium, nothing harsh, just high, with a great PH at 7.1.
I installed a ozone water purifying unit, after I installed a WH/cartridge filter, coming out of the well house. They knocked the PPM’s down to around 200-250.
I vaporized a couple of just rooted clones, when I first got my tiny HLG 65-V2 being so small, I lower it down a few inches from the top of some fresh rooted clones. Now I keep it way up, and it’s the best (veg) light source I’ve used in 20 years.
I had to keep notes hanging around on my various tents at times, as my head, would not, could not, keep all the details properly, to help fly my whacky perpetual set up, mostly with timing, so each of the steps have it’s part ready for the next, if that makes any sense at all.