Spots on floor of pool. What causes this and how do I get rid of them ? I am a new pool owner.

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
#2
Hello and welcome to the forum! :wave: Those are some interesting circular spots. Any UFOs in the area? :) Okay, let's start with the following:
1 - Update your signature with all of your pool and equipment info (see mine as an example). Appears to be plaster, but all info will help.
2 - How do you test your water?
3 - Can you post a full set of water results? (From TF-100 or Taylor K-2006)
4 - How do you chlorinate?
5 - Pool history? New, or existing home purchase? Anything else?
6 - Any autmoated cleaners used?

That should help us get started.
 
Dec 12, 2018
5
Coral Springs
#3
I use the TF-100 Pool test kit.
it is a Chlorine pool.
It was an existing pool with home purchase
I use a suction side cleaner We named him Flash after the Sloth in Zootopia

i will be testing the water this afternoon.
 

Texas Splash

Mod Squad
TFP Expert
LifeTime Supporter
#5
Spots of that particular pattern are not reminescent of typical organic or metal staining unless something round like that rested on the floor's surface for a while. I don't see how the cleaner could contribute to those. I have suspicions about the base underneath. Your water tests later might help. I'll ping the assistance of others to see what they think. @JamesW
 

JamesW

TFP Expert
Mar 2, 2011
12,822
#10
The spots are too perfect to be a chemistry issue.

I suspect that someone probably threw tabs in the pool.

I suspect that it probably wasn't the previous homeowner, but someone responsible for the house between owners.

Was the house unoccupied for a while?