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Re: Eheim reactor and algae

>You might try a denture cleaner to do the job.  In the US "Alka-seltzer" is
>used by some to clean air stones, ceramic diffusers and other hard-to-clean
>aquarium devices.  There should be a locally produced product for dentures
>in the Czech republic that you can try. 

Woops... I meant "Efferdent" not "Alka-seltzer"! :-)

Aquarium Plants & Driftwood