Gelato zamnesia

Some of the hairs are starting to turn brown and i dont like it it's to early for turning hairs in brown it's only week 3/4 of visible flowering so i don't know what it is my ph is 6.2 maybe it's the water itself because they are working in the street on the water pipes maybe it's a to high chloride in the water i don't know 🙈 hopefully they stop turning brown hairs for a few weeks until harvest