Calcium buildup? ?

[authentic]

I dose two part and have my tubing in a holder above the waterline in my sump.over time I get a buildup of what must be calcium directly under the tubing on the wall of my sump.why is this happening?tank is very stable ,now I am concerned about the amount I'm dosing after removing the block

 

[Randy Holmes-Farley Verified Community Expert]

It is normal for there to be some precipitate when high pH solutions hot the tank water. More flow and slower addition help.

This is what I got near where my limewater was added:

What is that Precipitate in My Reef Aquarium? by Randy Holmes-Farley - Reefkeeping.com
http://reefkeeping.com/issues/2005-07/rhf/index.htm

from it:

Figure 4. When limewater drips onto surfaces, such as the sides of a sump, precipitation of calcium carbonate takes place. The off-white coloration probably comes from metals such as iron binding to the calcium carbonate surface in the place of calcium.

 

[authentic]

Thanks Randy

 

[Randy Holmes-Farley Verified Community Expert]

You're welcome.

Happy Reefing.