I got my 302 hooked up yesterday. Had a lot of air issues. Can someone tell me if the water returning through the sprayer comes out fast or just runs out. Mine is just running out. Not much pressure. Still have more noise than anticipated. May be yet more air inside. Just trying to figure it out. Is it possible I could have to much media inside that is blocking water flow?
Don't have a 302 equivalent, so I can't address pressure issues. Rock the canister. If you have air in there, you'll hear it coming out. If you listen, you can hear if air is entering the canister. Until that stops, you're going to have air issues.
Reach out to their customer support. I know a lot of people have said they've had issues with customer service, but aside from delays on *my* end in the email correspondence (my work schedule precluded calling), I got timely responses that were helpful. In fact, during troubleshooting, turned out my UV bulb wasn't working, so they shipped one out to me, no charge.
I don't know about other canisters, but I'd imagine the only way to have too much media is to be squeezing it in. That just seems like a bad idea in general. Mine has 3 baskets. In the bottom, I left the included coarse filter and added another pad that I cut to shape/size. In the middle, I left the polishing pad on the bottom of the basket, and added ceramic (fluval biomax, a pound or liter or whatever the packaging holds) cylinders on top. Top basket I have a polishing pad, and a 100ml bag of purigen. I'm probably going to add another bag of purigen to that, because there's easily enough space for it.
As far as the quantity of flow, when I only used one section for the spray bar, aimed down the length of my tank, everything other than my BN, espeis, and RCS stayed as far away as they could. When I added the second section, the other fish ventured nearer, but still didn't seem to like it. now, I have it mounted on the long side of the tank, about the middle, pointed at an upward angle (if you look at it from the side closest to the canister, it's at about a 10:00 positioning) at the tank wall, and the fish roam the entire length of the tank again.
All that said, I have the one that's the next size up, and it's Aquatop branded, but it's apparently as different from the Sun Sun branding as a Plymouth Neon is from a Dodge Neon.
. Even so, still 100% better than I would do trying to compose Chinglish. Well see how she runs when I get the 55 setup.