Discoloration in Spa Plaster (Not in Pool) – Seeking Advice

[calisoldier]

Hello!

I’m hoping someone can help me figure out what’s going on with my spa. As you can see in the photos, there’s noticeable discoloration and blotchy staining in the spa area of my pool. What’s odd is that the main pool doesn’t have this issue—it’s isolated to the spa only.

I’ve tried scrubbing with a brush and even rubbing a chlorine tablet on some of the spots, but it didn’t really make a difference. That makes me wonder:

• Could this be a plaster issue (like mottling or mineral staining)?
• Could it be due to water chemistry differences between the spa and pool?
• Is there anything I can do to treat or reduce the appearance of these stains?

The plaster is about 6-7 years old, and I try to keep my water chemistry in check. Any thoughts or experiences would be really appreciated!

 

[ajw22]

• Could this be a plaster issue (like mottling or mineral staining)?

Could be iron or copper stains.

Stains in Your Pool

The stained pool is beyond embarrassing. Our in-depth Guide to remove stains in your pool will help you to remove the stains and prevent them in the future.

www.troublefreepool.com

Stain ID Kit | Jacks Magic

jacksmagic.com

• Could it be due to water chemistry differences between the spa and pool?

Nope.

• Is there anything I can do to treat or reduce the appearance of these stains?

Polish the areas with diamond sanding blocks or a power sander...

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

 

[calisoldier]

Could be iron or copper stains.

Stains in Your Pool

The stained pool is beyond embarrassing. Our in-depth Guide to remove stains in your pool will help you to remove the stains and prevent them in the future.

www.troublefreepool.com

Stain ID Kit | Jacks Magic

jacksmagic.com

Nope.


Polish the areas with diamond sanding blocks or a power sander...

Plaster Installation and Maintenance - Further Reading

www.troublefreepool.com

Sorry if this is a silly question, but do I need to drain the spa before attempting this? Also, if I polish specific areas, will they look noticeably different from the unpolished sections? What about areas where there’s pitting — how will those turn out?