On My First Grow

my plants have been flowering for about a month or so now my question is when do i change the water res to the flush cycle?!?!

I'm no hyrdo guy but its probably just like when you grow in potting soil or whatever... 2 weeks before harvesting. But seriously dont take it from me id actually get a hydro mans/womans input!

Anytime between one and two weeks before harvest. You can just use plain RO water, or there are some flushing additives sold at the hydro stores. I've tried both ways and can't tell the difference.

Vi

ViRedd said:

Anytime between one and two weeks before harvest. You can just use plain RO water, or there are some flushing additives sold at the hydro stores. I've tried both ways and can't tell the difference.

Vi

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Is it absolutely necessary to flush one or two weeks before harvest? What is RO water?
What if you had a few plants 4 weeks into flowering and you had a few plants that you added to the flowering room later that were only 1 week into flowering? Have you every had to deal with that situation?

i guess what im really asking is how will i know when to change the res water? i dont want to do it to soon or to late so how much longer should i let them flower b4 i consider changing it?

just change it 2 weeks before your intended day of harvest