Both bought. They both have their advantages.
The left for a longer overnight type of deal without having to haul rocks to make a ring.
The right. Fire anywhere! The ashes don't fall through which makes for easy cleanup. Also warm feet if you put them underneath. I don't know if I'm going insane, but I got the large which seems to no longer be listed on amazon.
Left: Camco 51091 Portable Campfire Ring https://www.amazon.com/dp/B00KJM7K52/ref=cm_sw_r_cp_apa_i_A6lbCbVXQ4ZQZ
Right: Rootless Portable Outdoor Fire Pit : Collapsing Steel Mesh Fireplace - Perfect for Camping, Backyard and Garden - Carrying Bag Included (Medium) https://www.amazon.com/dp/B01NBU7XLH/ref=cm_sw_r_cp_apa_i_A.lbCbJZVBG89
I use the yellow sticky traps and just recently gotten this mosquito trap that works for the fungus gnats.
I agree with the other post that MiracleGro potting mix may be part of your problem. I stopped using it because it seems to hold onto moisture too long.
Also, your fungus gnat problem may be seasonal. It is for me. In winter I never see them.
I can't find the exact kind that I bought two years ago. If you search "UV insect trap" on Amazon you can find the best one for you.
This one is similar to the one I bought:
Most of those corrugated metal culvert pipe assemblies that I've seen marketed for fire pits are typically about 12" deep, give or take an inch, and either 36" or 48" wide. This one looks like the 36" wide variety. My guess is about 16"-17" height above ground level for this fire pit.
Here are some links to similar fire rings on Amazon:
Sorry for the potato quality image. My photos kept coming up blank when uploading via the reddit app.
I received a gravity grill over Christmas and used one of those wide fire pits like this . I'm looking for something that can concentrate the heat a bit more. I love the solo stove but I'm not willing to invest that much (yet).
Maybe something like this? I also thought of simply making a small pit out of bricks but the cost of firebricks are pretty steep and I run the risk of explosions if I use cheap bricks.