aeration system algae bloom Algae control alternative to dredging beneficial bacteria boat dock cleaning catfish Chase Bank control algae conventional dredging problems cooling pond moss de-watering bags detention basin detention pond Dredging a pond epilimnion excess nutrients filamentous algae geotextile containers golf course pond algae grand lake mechanical dredging alternative metalimnion muck removal Old Moe phosphorus pond dye pond fertilizer problem pond moss pond stratification remove algae remove sediment retention pond scuds sediment Sediment Removal silt containers stormwater pond thermocline wet dredging