At the time this was written, my time in the hobby was about a year. End of 2009. Here we are now, Feb 2013. Last month, yes, I finally had to replace the peristaltic tubing. So, I don't see that as a ding against 2 part for maintenance or anything. 3+ years between replacing it is not a big deal IMO. It lasted a good long time (and that tubing is very cheap) Again, here we are several years later, and I am finding my earlier prediction is true. My jugs last several months before a fresh mix. The material I bought from BRS. Well, I did just buy new buckets of dry material. Haven't opened them yet, as I haven't finished off the original ones. But it's getting pretty close. So lasted me almost 4 years or so. That's a good long time between having to buy more material. In the past several years, due to coral demand, I've had to increase by a second four or five times (which takes about 20 seconds to adjust). Glad to update the thread with this information.