Keeping The Yuck In
Aluminum is great for a lot of applications, but, like stainless steel, it's susceptible to corrosion when there's no oxygen present, and especially when exposed to holding-tank waste. For the most part, there's not a lot of maintenance on the tank itself, but it does require periodic inspections.
For example, look at this hose connected to a spud that's welded onto the aluminum holding tank. When aluminum corrodes this way, it tends to bubble up. In this case, the metal swelled enough to split the hose, which could become a very unpleasant problem if not caught quickly. Take a look at all the hoses and clamps on your holding tank, and if there's any question, have it addressed right away. Your nose (and wallet) will thank you