sometimes, obvious helps. cutrine plus early on a sunny day? and all other instructions followed? offering this because i was using at dusk instead of dawn...
Definitely spray early in the day vs. at dusk. Other than that follow the instructions on the bottle.
Plants/algae need to be actively growing for the product to work. Applying it at dusk right before they "go to sleep" doesn't help at all. If applied in the morning, you will see the algae starting to turn color in a few hours if applied correctly.
