Thank you all.
Apologies for going over board.
Took me over a year to have this completed.

less than 2 weeks with water and boom..........scum.
It doubles itself in days.
Ive never seen anything replicate itself this fast.

The only answer I can come up with to eliminate the problem is ultra sonic. Costly.

But if that's what it takes, them I am going to buy the ss400.
Do you guys think this may be the solution? Additionally, this would seem to be much cheaper in the long run.

http://www.pondalgaesolutions.com/sonic-solutions-ss400.html