Well now you can use sodium percarbonate in your pool. I think you just got the pH Up and hydrogen peroxide, neither of which will be in sufficient quantities for your pool. So you'll have to buy sodium percarbonate. You can get it at The Chemistry Store. As for how much to get for your 15,000 gallon pool, if you want to you could redo your experiment with a half-dose or even a quarter-dose. That might save you money. The dosage I had you do was roughly 1 pound per 1000 gallons. That would be 15 pounds or about $40 worth of sodium percarbonate. I suspect it won't take that much. If you redo the bucket experiment (you don't need to wait as long now that we know that the CC is eliminated in less than 8 hours), then that could save you money if you find you only need half or one-quarter as much -- up to you.