Here is an update to my EV-180 with a 1" injector.
I've been running my protein with a 1" injector for over three weeks now. I ran it the first two weeks with the recommended water level and had a very, very, very small increase in skimming. It's nothing great to write about. I got a big boost in pressure with the bigger injector, so I had to install a ball valve to lower the water level in the protein skimmer.
Now here is the interesting part to my experiment. I wanted really fine bubbles and I want as much of it as I can get. I achieved it by restricting the air intake to the point where it's almost closed. It's nothing new to us. I removed the gate valve to reduce the backpressure. Thanks guys for the idea. I RAISED the water level to 1.5 inch below the collection cup. I now have water almost 80% filled up in the foam tower. I know it sounds crazy, but my protein skimmer is in a sump, and I'm not worrying about overflow. It's so much easier to adjust the air intake when you can see the water and the size of the bubbles in the foam tower. I adjust (restricting) it to the point where I can only see fine bubbles and lots of them. It's almost like a snow storm, but only with really fine bubbles. If I restrict the air intake too much, I get only a few big bubbles and then no bubble at all.
I thought the little amount of skimmate I've been getting was because of my light bioload and a new tank setup, but was I wrong. It used to take me a few days to collect enough skimmate to flow down the drain line. After I raised the water level above the recommended line, and choke the air intake, the collection cup fills up in 6-7 hours. I wonder how fast it'll be if I have a medium to high bioload. The skimmate is a little wet and has the color of light coffee.
I think the 1" injector produced a higher water pressure going into the protein skimmer. I can only guess that the extra pressure helps reduced the bubble size, and the higher water level gives the bubbles more contact time with the water. It's a little wetter than before because the foam have less room to condense, but the consistency of the foam is a little different.
I'm pleased with the result, and I think I'll keep it that way.
Can someone try it with their EV protein skimmer let us know of the result?