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Hi, If you are using organic or super soil,(no nutrients) you don't have to flush at all. You have been giving water To the plants all this time plus the micro organism growing in the soil feed the plant all the nutrients it needed. If you used. nutrients, stop nutrients, flush 1-2 weeks before harvest. Make sure your leaves don't turn Completely yellow when flushing. (Give water a good a mount of ph’ed water le dry and do the same for a gew weeks) Happy harvest and high funnn🤤👊!!!

Wash, you mean flush. Most of us flush between 1-2 weeks. Crystals will become more milky as the salts depleat from the medium.