RC, if the chara is in deeper water then the granules are the way to go. We used it in one pond this year and it worked great. The chara was in 3'-4' of water.

New growth was seen about 4-5 weeks after initial treatment, but the area was treated lightly.

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3/4 to 1 1/4 ac pond LMB, SMB, PS, BG, RES, CC, YP, Bardello BG, (RBT & Blue Tilapia - seasonal).