Hey bro! 👋 Flushing with distilled water won't improve your harvest results at all, so don't overspend on water if the plant's life is already coming to an end. However, I recommend using a cleansing solution like Flora Kleen; it will effectively dissolve the accumulated salts in the substrate and on the plant's roots, making the product healthier and more beneficial. 😉👌 Good luck, bro! 👋😇👍