What is this? Calcium has been around 240 to 260 usually but was as low as 200 at one point. It could also just be a build defect?
Is this calcium buildup?
- Thread starter buddyleex
- Start date
- Jul 21, 2013
- 65,894
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
I guess it was too big on my initial post. Here is a link:
Any input on this? No idea what it is I was able to scrape a bit of it off to expose the bluer plaster below. It has appeared about 1.5 months after pool build. Chemistry has been good since, calcium has been somewhat in the low end around 200-280 during that time point.
- Jul 21, 2013
- 65,894
- Pool Size
- 35000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-60
Looks like calcium nodules...
www.troublefreepool.com
@onBalance may have thoughts.
Calcium Nodules in pools
What are calcium nodules? In swimming pools and spas, they are small mounds, bumps, deposits, or “slag” piles of calcium carbonate which are formed from material that has been released from the plaster. The small calcium nodules are rough to the touch, hard, and generally gritty. Nodules may...
www.troublefreepool.com
@onBalance may have thoughts.
The one spot that I see in the middle of the photo seems to be a small defect in the plaster. Perhaps sanding with some wet&dry sandpaper will rectify it. The calcium level of the water is not a player in this particular spotting problem. Are there other spots in the pool?
Yes this one is the most major one about ~3"-4" in diameter. There are smaller spots around 1"-2" in diameter in a couple of more spots in the pool.
If they are calcium nodules, then each spot or nodule would have a raised rough deposit above the surrounding smooth plaster surface. Is your pool new, or is this a re-plaster job?
Then it is not likely that the problem is nodules forming. Are the spots fairly smooth, or are they raised and rough?
Keep an eye on the spots and see if anything changes over the next few weeks.
Keep an eye on the spots and see if anything changes over the next few weeks.
We checked the texture and it was just as smooth as the plaster around it. We'll keep an eye on it. Thanks!
