Hi Becca,
This is Joie from Big Block Aquarium Filters...we spoke earlier today about the filters, the forum and the upcoming events.
To answer Lock jaw's question, using the air lift principle, water is drawn through the sponge on the bottom of the filter and passes through the static media, and then into the chamber with the moving bed media. This allows the beneficial bacteria contained within the sponge and the static media to filter out the ammonia and nitrites (and some nitrates depending on the static media used). The moving bed media (K1) also removes ammonia and nitrites from the water column and is very efficient at doing so. The moving bed media also has the added benefit of removing older beneficial bacteria from its surfaces via the tumbling action caused by the air rising from the air stone. Our Facebook page has a few videos of the filter in action.
The filter is air driven and resides inside of the tank, so if there's a power outage, you shouldn't have as rapid a die-off of the beneficial bacteria you might see in a canister or HOB filter. I actually have several units on my personal tanks hooked up to a backup battery (the type used for computers) and when the power has gone out, it kept running for a couple of hours until the power came back on...the fish were none the wiser! You could probably hook up a canister filter or HOB to a backup battery, but it would most likely drain the battery much faster.
The only part of the filter that really needs cleaning is the sponge filter, which you can rinse out in tank water (in a separate bucket, not the actual tank) and replace back into the filter. I personally clean my filters out twice a year and that's with 6+ adult discus being fed three times a day. If there's a question of whether the filter needs cleaning, all you have to do is inspect the media through the front window, it's that easy.
I could keep rambling on, but if anyone has specific questions, please feel free to ask and I'll do my best to answer.
Thanks,
Joie