Hello all. I have a RO/DI water filter that I used for my Marine Fish Tank in my last house. Never set the tank back up after i moved 3 years ago. Two questions for the GC. 1. Is Deionized water usefull for hydroponics? Or Should i take that stage off the filter and just use the carbon and RO filters? 2. The Unit was sitting in my basement still filled with water. I will change the carbon and sediment filters but is the RO filter still ok to use? I pretty sure it has not dried out. Thxs for you help ahead of time, these forums are a real big help!