Thanks Dave. I got a 2 gallon bucket from Home Depot with all kinds of different measurements marked on the inside. It worked like a charm. You are correct about the higher strength sodium hypo. The batch I used today tested out at 15.5% in the lab. We had some today that was 22%. Anyway, I added it at dusk and poured it slowly into one of the waterfalls in the deep end. The pump is going to run for three hours. I'll test the chlorine tomorrow and add as needed.