I am using red wigglers in my beds and been going 1 year with 1200 gallon FT with with 725 cubic foot grow media. I have some build up but you need to have a inch or so of nutrient filled sediment at the bottom of the grow beds. I assume at some point I will still need to "clean" out the beds.
I believe most media systems operate without a swirl tank and without cleaning media beds
ok thanks, trying to figure out next system.
i have used red wigglers for 2 years works good
It depends so upon your particular system. In my 2500g system with trout I got tired of solids getting to the GBs for visual reasons more than chemistry reasons so I added a simple to make 15g swirl that catches most floaters and sinkers. What gets thru (suspended solids) I trap with a short "gravel guard" type filter at each GB inlet. This keeps the GBs a lot more eye appealing. As to DWC I use sump water that is already clarified by the media beds. Best simple solution there.
I only have a 10 gallon system right now looking at doing a 50 gallon and need to do my research first to get a good plan, Jim if you filter out solids are you still getting the bacteria to get plant growth?