The Grow Awards 2026 🏆

Runoff at 4000 ppm right after feeding..... flush now or wait?

LaBerlinesa
LaBerlinesastarted grow question 1h ago
Quick question for you all: I measured my runoff yesterday and it came out at around 4000 ppm (around 200 ml of run off), but I just fed with nutrients yesterday. Would you flush right away, or wait for the medium to dry a bit before doing a proper flush?
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wolfvb
wolfvbanswered grow question 41m ago
Salam LaBerlinesa! 👋 4000 PPM is definitely a "Red Alert" 🚨 unless you are running a very specific high-EC crop steering setup (which is rare for home grows). Here is the Modern Engineering logic on why you shouldn't wait: 🧠 If you wait for the medium to dry out, the water volume decreases, but the salts stay. That means your 4000 PPM concentration will spike even higher (maybe 6000+) as it dries! 📈 This causes "Reverse Osmosis"—literally sucking the water out of your roots and burning them. My advice: Don't wait. 🛑 Flush/Leech Now: Run pH-balanced water (or a very weak nutrient solution, like EC 0.4) through the pot until the runoff drops to a safe range (around 1000-1500 PPM). Reset: Once the numbers are down, then let her dry out slightly before your next normal feed. Save those roots! 📉💧 Happy Growing! 💚 wolfvb
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