Metricide 14. Excel did not melt my Vals (Spiral or Italian) but Metricide 14 took the beauties to there knees. I had OD for algae control with the Excel and had minor damage to the Vals, but on small doses of Metricide 14 I found them to show significant signs of damage but shrugged it off to other factors. Not until I gave a full dose of Metricide 14 did I see what horrible things it could do. After first night the plants looked semi translucent, by day two they were falling apart, and by day 3 it was a complete break down of the plant nearly to the root. I will send current photo's to show the current growth. I would sell some now but am afraid they would be overly stressed and die. Hopefully they send off runners soon and I can spread the plant to more that want them.