When and how to flush?

Ok im about 2 weeks from harvest in a bubbler, trying to figure out what would be the best way to flush these babies. They are dark green and fruity, busting with crystal about 25% red hairs and the trics are mostly clear (50%) some cloudy (30%) and a few amber (20%). I may go to 3 weeks or 2+ a few. Anyway Im in heavy nutes now and the plants love it, no deficiencies or issues. PH 5.6 ec 2.9. Should I just dump my res and go with straight RO water? Dump half and dilite with RO water? Any help is appreciated.

Thanks in advance

im going to use advanced nutients final phase when it comes time. just give it ph water some say sugar water.

Any thoughts?

Use a rinse solution like Advanced Nutrients Final Phase or General Hydroponics FloraKleen (something like that) the last few days before harvest (or whatever the manufacturer recommends).