I think if you actually saw how fast and how badly a canister got gunked up, you'd never buy one, or at least realize they need much more cleaning than they normally get.

Larger Odyssea canisters have a clear housing and have been around for years. I own 4 of them right nowView attachment 1233991
Now those I have heard of and I think they still sell them.If you want a real old school shout out on a transparent, external filter, the Diatom water polishing filters from the 60's onwards were completely transparent, glass mason jars.
Just snapped this pic. The filter hasn't been cleaned in a couple of months.......unfortunately.
.......not too mucky looking though, I don't think
View attachment 1233993
Are these guys for sale on Amazon? Model name?
ThanksI've bought all of mine from aquatraders.com, but they've shut down. But, I've seen them on Ebay before. Mine, that's pictured, is the CFS700
The CFS14i looks pretty dope tooI've bought all of mine from aquatraders.com, but they've shut down. But, I've seen them on Ebay before. Mine, that's pictured, is the CFS700