put some api accu-clear in pond on two consecutive days and saw about 70 to 80 per cent increase in clarity . few days later i added a cup of salt bringing salinity to .06 percent . next morning i couldn't believe my eyes , the water was absolutely crystal clear . it was just like it was , visually , in past years . i'm a very unhappy person and was extremely pleased to find it cleared , best thing i've experienced in months . . . .peace