Saw your note on Liqui-Shock. I discovered same. I'm concerned about buying bulk as I understand it breaks down. Starts with sodium hypochlorite at 14% but drops to 12% w/i 2 weeks, and to as low as 9% after 30 days. I guess that's why it's shown at 10%. I just went thru heavy algae removal. It took over 24 gallons for a 24,000 gal pool. 8 gallons/night of superchorinating for 3 nights in a row.