Root rot hydro Flood table

My new Well sometimes brings in dirty water and I filled my rezi with some fine SANDY WATER AND my roots starting to look brown and I use alot of dark nutes.. table sucks doesn't drain all the way.. First time hydro I flushed it with peroxide water today just assuming that would help..Week 2 today into flower. PLants looks 100 percent healthy some roots did look like maybe wanting to get slimy if that makes any sence..Any info is highly appreciated

You may want to explain your grow. Media nutes ppm ph. Fertigation frequency.

Run a sterile system..

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You probably want to add filtration to your well. We currently run a 50 micron spin down filter, a 5 micron sediment filter, and a carbon filter.