Hi Bubba's girl I wish I had added gypsum at the beginning and each month after that. It would have probably saved some fan leaves from drying up on the no-till pots. I look forward to next grow doing the ro and ro + tap along with fresh soils vs the depleted no-till. I have done most of my growing in 3 gallon containers. I'll be moving to more 5 gallon containers next grow. Around me most supermarkets sell it from machines for $.25 a gallon. Walmart and other store usually have it. There is also a water store near me that sells for the same price and will steam clean the jugs for free. Both are good RO water. Before getting my machine I would do it that way, take my jugs and fill them.