Need help...still cloudy after more than a week...very hard water

[PoolDoc]

Membership upgraded . . .

. . . the 'gold standard' for completed conversion is the overnight chlorine test:
+ Raise your chlorine above 10 ppm, late in they day.
+ Measure the level carefully near sunset.
+ Retest in the AM no later than 1 hour after sunrise.
+ If you've lost less than 0.5 ppm of chlorine, your conversion is complete, or very nearly complete, and you can change your sand.