I used to use Xtol replenished in a Kodak deep tank. But that was when I was doing 18-24 rolls of film a week. Now I just do 2 to 6, so I don't use the deep tanks anymore. As to D-23, there is a specific replenisher; unlike Xtol, the stock solution does not also serve as the replenisher. The floaters don't seem to harm the film, but I do filter them out before using the stock solution. There are so many of them, I have to clean the filter at least once to get 500 ml. filtered. That's a pain.