I don't know why all this has happen to this apt complex's ponds. They have been mishandled for so long and now I get to try and revive them. The company does not have the equipment to be able to empty these ponds one at a time and thoroughly clean them. They expressed their concern of cost to refill them? I can't give them what they want (crystal blue) without a major overhaul. Yeah you don't have to be surprised, there is a ton of algae. I tried to purchase a 100 lb tub of algae killer for $350 due to extra funds that rolled over from the previous month but they did not approve the PO for it and said that cal-hypo will do the same. But the cal-hypo eliminates the dye too.