I am sorry, I must have missed something. The way it read was that the deer netting was your biofilter. Cecil uses his deer netting as a pre filter. Big difference. 200 to 300 microns going into a submerged static biofilter is not the best plan. You will want to tighten that up a bit. I suggested a simple bag filter as a pre filter. I would choose that over the netting, why? they are cost effective, simple and work. You can get them in any micron rating and they come in many FDA compliant flavors. Plus, they are easy to clean.
HVAC filters often contain unwanted chemicals such as fire retardants. Be careful if you select one of them.
Microscreen filters are a great thing. Depends on how much money you want to spend, not just on components, but operational costs as well.
Back in the 90's, everybody and their brothers were out to invent a better mouse trap. Some of the stuff was pretty neat, a lot of it was also impractical or it never worked and was actually sold to consumers. I especially liked one companies take on fish harvesting. The tanks were circular and had a liner. When you wanted to harvest or grade your fish, you simply pumped air under the liner. It blew up like a balloon and all the water and fish were directed into a channel. I wonder how many times you could blow one up before a failure occurred.
Many books were written. A lot of them are no longer in print.
The book Cecil mentioned by Steve VanGorder is a very good one. Simple and practical.
It sure would be interesting to hear the whole story about a new fish hatchery that was built in Alaska. I was talking to an employee there and they were a bit nervous because things were not going as smoothly as promised.
