Balance Pak 200 is a water balancer used to raise the pH level in your pool. Low pH levels can cause corrosion on pool equipment, wrinkling or liners or plaster etching. Low pH levels also reduce bather comfort and cause high eye irritation for swimmers. Ideal pH range in a pool is 7.4-7.6. That being said, low pH can cause these problems but if pH levels get too high, they can also cause similar issues in your pool water.