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Brown algae and scratched glass



In a message dated 1/22/02 4:00:35 AM Eastern Standard Time, 
Aquatic-Plants-Owner at actwin_com writes:

<<  any broad-surfaced glass cleaning sponge or pad, no
 matter how soft or non-abrasive, can cause scratches due to the ability of
 silt to cling to algae growing on the glass, or otherwise become suspended
 in the water and get trapped between the cleaning pad and glass. >>

I think it is Brown algae that has a sandy texture from the diatoms or 
silicates it produces.

I forget... 

Anyway, is it possible some of this stuff might get involved in the glass 
being scratched as well?

Bob Olesen