Pitting corrosion on aluminum coping

garym

Member
Oct 3, 2010
9
Pennsylvania
I am getting pitting corrosion on a section of aluminum coping closest to the equipment pad. I assume this is due the SWG system. How can I repair the coping to fill the holes?
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
16,904
Tucson, AZ
Can you post a picture?

Generally speaking, you really don't want aluminum anywhere near a pool and certainly not near an SWG pool. If you do have aluminum, then it should be anodized aluminum. Also, any aluminum near the pool should be tied to a sacrificial anode (magnesium works best for aluminum). This will slow down the corrosion.
 

InPoolSWG

New member
Sep 8, 2018
1
Buffalo New York
Can you post a picture?

Generally speaking, you really don't want aluminum anywhere near a pool and certainly not near an SWG pool. If you do have aluminum, then it should be anodized aluminum. Also, any aluminum near the pool should be tied to a sacrificial anode (magnesium works best for aluminum). This will slow down the corrosion.
I have the same problem, the coping is 20 years old, never had a problem. Changed to Salt Water 3 years ago. Pictures attached of the pitting. It is mostly on the ends of the pool, I suspect that since the solar cover is a little long the sun & heat may have accelerated these areas. The pool company recommended a product called POR. It is a multi-part treatment, solution to clean, seal and recoat the pitted area

I see sacrificial anodes for sale that go in the filter basket. Do these need to be tied to ground? Product info implies that just tie them to the filter basket.
 

Attachments

PoolguyinCT

In The Industry
Jul 21, 2014
3,077
Connecticut
To the liner pool above..
a few years ago I came across similar pitting,
the problem was traced back to a corrupt bond, and some low voltage utility- cable, lights, just don’t remember.
 

JoyfulNoise

TFP Expert
Platinum Supporter
May 23, 2015
16,904
Tucson, AZ
Those zinc “anodes” in the pool aren’t going to do anything useful for you. Check the bonding on the track to make sure it’s working. I’d follow the suggestion of the pool company to clean and seal the metal as long as the corrosion is just some surface smutting. If the track has been compromised with corrosion going through the metal, then it may need replacement.