The CYA is sold at Home Depot, Lowe's, Walmart, etc as well as the pool store. It is labeled "conditioner" or "stabilizer" or "balancer", but look at the ingredient....cyanuric or isocyanuric acid is what you want. The baking soda that Watermom referred to is plan baking soda like you cook with--available at any grocery store in the aisle with the flour and sugar.

Your best bet at this point is to go to WalMart and pick up some baking soda and several gallons of plain, unscented, generic bleach. Take a sample of your pool water and let the pool store test it, specifically for CYA--but don't let them sell you the list of stuff they'll try to convince you to buy. Come back and post that CYA number, and we can help you go from there!

Janet