Product review (5 stars): Amazing Product!
Our 300 gallon pond had a huge algae bloom and the water had turned a murky green color.  It was so bad you could not see the fish at all.  The salesman at the pond store said we needed to replace our current pump/filter with a $400 one in order to solve the problem.  Luckily I chose to try Laguna Clear Fast before taking on that expense.  The product information does not specifically say it will work to clump algae, but it does!  24 hours after the first dose, I was disappointed.  No change.  The directions state that a 2nd dose can be added.  I added the 2nd dose preparing to be disappointed again.  I had only spent about $12 on the 16 oz bottle, so no big deal.  When I looked at the pond 12 hours after the 2nd dose, I could not believe how clear the water was!  It was like magic!  I took the filters out to rinse them and they were covered in green muck.  They looked like pieces of astro-turf.  Although the product directions do not say a 3rd dose can be added, I did anyway just in case there was more algae floating around.  The next day, the pond was crystal clear; I didn't think it could get any clearer. The filters were covered in green muck again and there were tufts of algae around the filter as well.  Three days after using this product, the pond went from looking like bog water to swimming pool water.  It is truly amazing and I would buy it again. Note:  I did not shake the bottle before applying the first dose.  I don't remember if the directions say to shake well or not.  However, before adding the 2nd dose, I shook the bottle really well.  I don't know if that is what made the difference on it working after the 2nd dose.  So, shake well before using just in case.