bigal,
Thanks for the warning,lol! This however "MAY" be different. First, the ceramic beads are fully submerged in seawater. Not like the Wet-Dry filters that where based off of sewage treatment plants. Those types of filters had the bio media not fully sumerged, but out of the water with water running over them. This did two things:
1. Broke the water down to a smaller size allowing more oxygenation and a much broader surface area.
2. Allowed the bacteria a much more abundant supply of oxygen. Which allowed for substantially more bacteria per sq inch. Speeding up the consumption of ammonia and nitrite greatly.
These bio beads or rings may in essence work just like filling the chamber up with rock or sand. The inner most part of the bag where the beads are may house bacteria to consume nitrates are well. This area will in my opinion will be a very low flow area Al.
If this is the case, we will then be safe-gaurding our system and improving water quality as well.
Another plus to adding this bag is creating a breeding area for copepodes and other small organisms.
The bag is of a large micron size, so sloshing the bag in a bucket of clean seawater or even the compartment(may) will be sufficient for removing debris.....
As I stated, I do not feel this is a Wet-Dry type of system. The basic dynamics that make a wet-Dry so efficient are just not there with this.
Time will tell, and if I am wrong I will certainly "EAT CROW" Al. It will not be the first time...............LOL