I can tell you confidently that the reactor I have works great. I change the media when I start to see phosphate creep back up. You can buy different media. Some last a couple of months. Some last only a month. I noticed a different the very next water test I did I would say about 2 or 3 days later. I had a bad phosphate problem that was feeding a red slime problem. Along with rinsing frozen foods, using RO water, and the reactor my phospahtes are 0
...O and no red slime.
I Know a guy that makes saltwater equip, and works with acrylic so I dont have a brand for you. I can tell you that it is a basic design, and I dont see why you would need a complicated model honestly.
Good luck on your search