1 cup of slurry didn't clear it very well, so looks likle I'm going with a cup and half which by the guide, that's about 280 lbs of gypsum (7 x 40 lb. bags). Got a 12v spray rig already lined up. 30 gallons of clean water mixed with one 40 lb bag of gypsum into a slurry and sprayed from my shoreline, at 7 equal distant spots. Guy tells me it will easily spray to 25 foot mark. I'll take some before, during spraying and 3 days later
