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Polish filters

I just ordered a HOT Magnum to use as a polish filter. The literature says
is filters down to one micron. Two things I think I remember reading and
wondering if someone can shed some light on.

I read that 1 micron is sufficient to filter out algae spores. If that is so
would there be an advantage to running the filter every time I do a water
change? This is assuming that there is algae spores in the tap water? Before
I ever started growing plants I had green algae, so I am thinking that it
must be in the water.

Jeff <*\\><
 Mt. 4:19 And he saith unto them, Follow me,
and I will make you fishers of men.