^^^you should never chase ph, especially if your plants aren't displaying any issues. if you ph "everything" you put in/on your plants correctly, then ph should never be an issue. instead of a large flush, i suggest when you water/feed, always allow for some runoff. this will act as a mini-flush, and eliminate the need for a flush altogether, until the harvest time flush. i'm also a coco fan and will never go back to soil!