Mysterious substance coming from sun shelf bubblers.

[floridapoolfan]

Our pool is about a year and a half old and we have an almost cement like substance that is dark gray coming only from our sun shelf bubblers. I checked the basket for the pool pump and none of the material is being caught in there, I also checked the pool filter and none of the material is being caught in there either. It only seems to be coming from the pipes in the sun shelf bubblers. If the pool wasn’t almost 2 years old I would just think that it is material that was in the pipes from construction but I have not seen any of this until now

 

[zea3]

It may be old bits of plaster and gunite from pool construction. Sometimes it takes a while for the chunks to loosen up and come out the pipes. How large are the chunks?

 

[floridapoolfan]

Hopefully that’s what it is but I got nervous since the pool is 1.5 years old. The largest one so far is about 2 inches.