Also, you can get up to 50 off seeds with a variety of shipping options with guaranteed stealth unmarked shipping to keep your seeds safe on their way to you. Unmodified water is used to flush hydroponic and soilless systems regularly. To determine if your cannabis buds are ready for flushing, follow these steps. Source: http://bbs.ddcnc.com/forum.php?mod=viewthread&tid=4111