Question: asked about algal bloom in pond
Answer: told him to remove the algal bloom by taking a split bamboo piece and drag it from one end to another through the surface and remove it. 
apply lime at a dose of 5kg for half a bigha pond and do aeration. also recommended to do use potassium crystal (potassium permanganate) of 250 gm at night by mixing in water and repeat this after 4 days.