Brewer pump advice?

Making a small air lift brewer. I calculate that the container is just shy of 18L (just shy of 4galus). anyone have advice for a small build like this one. I plumbed/constructed it with 3/4" Pvc as the parts were laying around. I'm sure the smaller pipe might lend itself to.clogging but I'm fond of the opacity of the material and it fits away nicely. I know most diy build have lrgr diam. Pipe but I had everything to make this except the pump so if I'm wrong I'll try again with larger dia. Pipe.

My question is can anyone recommend a pump. I'm trying to avoid anything that will run too hot. I have lots of experience with small aquarium pumps and large commercial pumps as I have a background in water treatment.

I have the female injection point removed in the picture as you can see.

I used the Eco model 55$CND Amazon.ca. I saw this model in a diy vid on YouTube for a similar (larger) brewer. The shroud (which was 100% needed) was made from 2nd pot same diameter (10.5"). That pot has drain holes so as to dampen the splashing/contain froth and let tea drain back down into res. below. My Bokashi bucket seems to work nicely to support the pump above the brewer. This looks like it will brew a mean fuckin tea and the pots used are opaque.

Even though I didn't get any response to this thread I thought I should post a few pictures and contribute as I didn't find any small brewer designs and we all know space is important in a grow and organics do take up space. To all!