The color is great but it's still slightly cloudy. I can see the outline of the deep end but no detail. The shallow end appears clear but obviously isn't quite. We backwashed on Friday and vacuumed yesterday but it's hard to know if there's anything else down there since I can't see well. The test results appear that it's ok to swim in but we have a birthday party on Wednesday and I'd like it to be clear. What am I missing?