Yes, I have increased my calcium levels to 250 to 300. It has really taken the staining way down. However when I put in the stain treatment I get a milky mess - but once the pool clears the stains stay mostly away. I noticed one year that my pool water was tinted green, when I added the calcium the water turned blue. THat is when I started to keep calcium up in my pool. This year after the stain treatment my calcium level went from 300 to 175. I then added calcium to bring it back to 250. Do you think that the fallout of the calcium combined with the metals to filter out of the water? This is what I was thinking happened and that is why it may not be the culator that has prevented the stains?