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So I am venting through my dryer vent using a Y duct. The issue is that my exhaust fan is so powerful it pressurizes the dryer vent duct and send the smells back up into my dryer, so it smells like I'm growing inside my dryer. I tried using a one-way flap in that duct which did keep probably 90%...

Looks like the PH was too high, should be 5.8 in DWC and also the rez water temp should be 19 ~ 20 celcius and if your airstones aren't really pumping air into the water that's cool enough to hold dissolved oxygen, your gonna get wilty dying / drowning plants. Root rot from a male that got...

Hope someone knows why.....I'm suddenly having PH down swings with my first hyrdo grow. 18 days into first noticable flower everything has been perfect till last 3 days. Now PH falls rapidly every 4 hours or so. Roots all look fine visually ...don't see anything rotting or like that, all nice...