Dithiopyr is a selective pre emergent. A better option would be total vegetation control. However, I am not sure that either of those would stop black algae from growing. Which is one of the problems I was working to eliminate.
Early results show that the Prism grout seems much better than Polyblend. But of course only time will tell. I am going to do another big section in a few weeks when I get some more time.
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