I have noticeable staining around the pool walls at the base of the pool and some on the floor of the pool. I added 2lbs + 8 oz. of OA for stain removal. Stains appear to have lightened but still noticeable. After using the OA, pool has no hardness. Should I add more OA to attemp to remove the staining before bringing the hardness back in line? I also used a sequestering agent after putting the OA in the water.