Have you ever smoked pot that has that smelled like freshly mowed lawn clippings and had a burning after taste? Did it snap, crackle and pop like a bowl of Rice Crispies?
You just smoked pot that wasn't flushed properly.
Flushing is one of the most important aspects of my grow. Some will argue that it is not needed. Don't listen to them! Trust me on this, flushing really helps improve the smell and flavor of your bud.
I start my flush 2 weeks before harvest. I drain the rez and fill it with tap water.
I let the pump run constantly for about an hour to wash out any nutes hanging around.
Then I drain the rez and refill it. I add 150ml of Clearex and let the pump run normally for 24hrs.
After one day I drain the water/clearex and run just straight water for the next two weeks.
I always keep my PH at 5.8
I check the rez every couple of days. If I see the PPM climb more than 50 PPM I'll do another rez change
Your plants will start to turn colors during the flush. This is good. It means that the plant is using up all the available nutrients.
I've seen purple, red, yellow and blue during the flush.
At the end of 2 weeks your plants should be ready for harvest.