What are the little black spots in my fiberglass pool?

When you see little black spots on your fiberglass swimming pool, it could be a few things.  First, try to remove them with a vitamin C tablet.  If that doesn’t work, then have your water chemistry tested to see if you have a high phosphate level.  If you do, use a phosphate remover then balance […]

Use CuLator Ultra 4.0 to Remove 0.4 Copper from 31,000 Gallons

CuLator Ultra 4.0

I have 0.4 copper in my pool currently. I am treating my pool for almost 3K ppb phosphate now. I used a sequestering agent a few weeks ago (Bioguard/SparkleUp) and then cleaned the filter with no reduction in copper. Do I need to add another sequestering agent to the water when I add the culator […]