This is such a great response, TYVM I think I wasn't too clear somehow so sorry for the mix ups. This biowheel thing is for my freshwater planted tank. I ran a reef for years but just started my freshwater tank a few months ago (maybe not even a few months, can't remember exactly now). I'm still learning about how to run a healthy freshwater planted system. It's not as simple as I thought it would be but it's been fun and interesting learning. And oh lordy, it would be absolutely crazy to use something like this on a saltwater system although I suppose it could help, IDK. I guess I just hadn't thought about cleaning the box itself even though I'm rinsing the filter pad in old tankwater when doing a wc.