My thoughts are an algae bloom is a good thing as long as you clearity doesn't go below 12 inches. It keeps your macrophytes in check (bottom growing weeds) and is the base of the food chain. When you end up with crystal clear water you have weed problems on the horizon.

I have an algae bloom this year after not having one for the last two years. The water was crystal clear the last two years and the chara went nuts. I'll take the algae bloom any day.

We swim in the pond with the algae bloom daily with no problems. Please don't take offense with this comment, but if you want crystal clear water build a swimming pool and treat it with chlorine.

If your pond had an algae bloom initially with no nutrients purposely added by you, I have to question where your nutrients are coming from. Do you fertilize your grass around the pond? Do you have an farm run off?

Keep in mind if you're have having a lot of sunny days this can temporarily enhance your bloom also.

If pigs could fly bacon would be harder to come by and there would be a lot of damaged trees.