Green to Clean Overnight! | Crystal Clear in 24H | Aqua-Guardian ProEvery Weekend Is the Same Frustrating Cycle It's Saturday morning again. You're standing by the pond, holding a bottle of chemicals, staring at that water surface that's turned a sickly green black. You already applied algae killer last week. You waited a full 5 days, hoping to see some sign of improvement. The water surface might be slightly clearer maybe. But the algae? Still growing like crazy. Two weeks later, it's worse than before. Your