"RedForeman ©®" wrote in message
...

If you've followed the group for any length of time, TomBarr has mentioned
several times that phospate is one element that is usually linked to algae
problems... it was in mine....

Yes, phosphate is associated with algae problems, but I think what Tom Barr
emphasizes is that it's the *lack* of phosphate that's linked to algae
problems. Filtering out the PO4 will most likely not fix the algae problems.
What will do it is adding back all the deficient nutrients other than
phosphate.
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Alex