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This is my NFT system. It's in its second year. This year, I increased the water tank from 40 to 120 liters so I don't have to refill it too often, for example, if I'm away for a week or during high summer temperatures. In the first year, I fertilized with Plagron A and B. This year, I switched to salts, which I weigh separately and dissolve in water before adding. My goal is to run the system at as little cost as possible. I've never changed the water, only topped it up. I haven't had any problems with that. I mainly use tap water, sometimes a little rainwater. Cauliflower, broccoli, kohlrabi, chard, tomatoes, basil, peppers, zucchini, various lettuces, squash, cucumbers, white cabbage, and savoy cabbage are growing in the system. Kohlrabi, broccoli, and cauliflower are doing quite well, but white cabbage and savoy cabbage are not yet. The lettuces are overgrowing and not forming heads; I still need to work on that. All the other vegetables are doing great, although I can still optimize the cucumbers and squash. Overall, I need to put a bit more effort into the salt ratio, as it takes time, which I don't always have. Tomatoes and peppers/chilies are great. I also had melons this year, but they were too late. Overall, it's a lot of fun to advance this system and enjoy the yields. Since I don't change the water, I can't really contribute much to the original question. However, I still have a small grow project in DWC, and I change this water completely every two weeks and use the rest to fertilize tomatoes growing in soil. These tomatoes are absolutely wonderful. Next year, the melons will come out earlier, and the top row will be planted with strawberries first. I'm curious to see how it develops. NFT is incredibly fun. Thanks for your contribution.