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I think they work, but there have been multiple reports even from Randy Farley that they do leech aluminum into the water column. Although it seems to be a small amount and when I ran them for over 3 years I didn’t notice any negative effects.
Why risk it, get some Siporax. I have the large rings that were imported from Germany (they stack better), but the small rings come in nice little mesh bags.
I have some more large rings in my garage that I’m not using. If you can’t find any, let me know. I might part with some. I bought 50 liters initially.
I've also been using the 4" block and the Spheres for a couple years.
The aluminum leaching thing bothers me as does the brittleness of the Marine pure in general.
These new spheres I got shouldn't have that problem of breaking down into dust like marinepure.
Maxspect Nano-Tech Bio-Block Ultra-Compact Biological Filtration MediaMaxspect’s Nano-Tech Bio-Blocks are a durable dense arrangement of small spheres creating an ultra-high surface area media which reduces the volume of bio-media actually required for efficient nutrient cycling in both fresh and sa
Actually, I just realized that I bought the Maxspect Nano-tech Bio-Spheres about a month ago from FJW, and I won the Maxspect Nano-Tech Bio-Block during the Christmas Party raffle! forgot I moved the Marine Pure into the canister filter of my QT, so I just need to remove the Marine Pure blocks and get rid of them.