Good to know, thanks👍. Do you leave it in the system of take it out after use? I guess I could always get an I tank one and only throw it in when in use.
I take it out after use - the main function is to zap the algae and other stuff floating in the water column after my maintenance/water change.
This is a photo of a 100micron pad installed 1 hour after water change and maintenance. My maintenance technique - scraper/toothbrush leads to algae being dumped into the water column.
Hanuman's suggestion is to use paper towels to rub off algae instead of scrapers/brushes which dump the algae into the water column, so thats another possible solution.
With 10x filter circulation, the tank water should have gone through my canister filters 10 times after 1 hour. Despite this, there is a green algae in the water column not visible to the eye (and not caught by regular filter sponges).
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