Is watering with reverse osmosis water one time before harvest sufficient, or do i need to do a second?
One flush for 7 days. After draining the container I pour water over the roots to knock off any fertilizer. Drain again and then fresh water. Two wouldn't hurt if you have the time. Change after 3 days then 4 days to harvest. I have only used organic fertilizers so I don't know how this method works with chemical fert's.