Hey bud. That's great stuff. If you want to. You can use the flushing solution now to be on the safe side. Depending on if you tapered off towards end with nutes or not. But I'd suggest if yr gonna use a solution to do it like now. For a day or 2 and then continue with plain water after. Or you could just stick with what your doing now and cont with plain water. Up to you. Only you truly know your plants