I use PondCare AlgaeFix once early each spring after the spring string
algae bloom and while my plants are beginning to come back to life and
beginning to control the nutrients. I add a new bale of barley straw,
use AlgaeFix, and bring my marginal plants up from the bottom of pond
and put them on their benches. A month ago my pond was covered with
sring algae when I did this and now my pond is completely clear of
string algae.

I have fish, frogs, snails, a snake and lots of plants and they seem to
prosper with this procedure.
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18,000 gallon (17'x 47'x 2-4') lily pond garden in Zone 6
Cheers, Steve Henning in Reading, PA USA