I am starting week 2 of clones. It’s a indoor tent, 18 hour lights on, 5.8 ph continuousl, water temp at 68 continuously and ppm is at 700. Do I need to change out the water? plants look great, roots coming through and getting long.. also, I am using GH trio, if I don't have to change out the water, do I add 33% of the chart requirements to my DWC for week 2 as specified?
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The rule of thumb is to change out the reservoir once a week. Some growers are able to push it to once every two weeks, while other growers change their res more frequently, like every 5 days.