SmallPoolDad:

Wonderful exposition! I learned a lot--and clearly your "Black Algae" is not the same species we see in the North Eastern states.

I learned:
1) Don't buy an old pool!
2) If you do, have wire brushes.
3) Don't keep a pool in Hawaii unless you want a lot of work--and if you do, make it vinyl!
4) Hawaiians are just like everyone else--they breed their share of bigots just like the rest of us.