Exactly. The main problem with any mechanical filter is that it needs to be kept clean, or it just acts as a handy place for things to rot.
I use canisters all the time, but usually either empty for circulation or for short-term use of chemical media.
Marty, if you can come up with a good design for a canister which makes a good cheeto chamber, namely having it's own light, a slow flow, and keeps the cheeto securely inside it, then you may well have a highly marketable product. LOTS of folks would love the benefits of algal filtration with the convenience of a canister.
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