Yes, you need to change your filter media first, then add stabilizer. It can be bought at WalMart/Home Depot/Lowe's/ any place with a pool section, and is also called balancer or conditioner. Cyanuric acid or isocyanuric acid is the ingredient you're looking for. Follow label directions to get your pool to 20-40 ppm, and don't retest or add more for at least a week. In the meantime, watch your chlorine daily because it will continue to drop due to sun until the stabilizer dissolves.
Congratulations on the conversion!!
Janet
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