Recent content by Marmeade

Intrigued by your sulfate angle, I measured my pool water’s sulfate level today using test strips by Quantofix. It was less than 200 mg / L (200 ppm), essentially undetectable with the semi-quantitative test strips I used. My records indicate that I’ve added Leslies Dry Acid (93% Sodium...

Thanks ybaser. The only metal contact for them seems to me to be the base light ring, and the overlying light ring. Both from Pentair for this purpose. But I’ll definitely check this when I have them replaced next week. Unfortunately, they’ll be replaced by the same products from the same company.

Wow! I never knew that! Good to know! I’ll change to muratic acid immediately. Is there a way to measure sulphate levels? The 110 AC light was changed to a 12 VDC light by a pool electrician two years ago, so I assumed that he did it right (famous last words) The light seems to work OK. How...

Thanks for the information, Bill1974. The pool pH hasn’t been below 7.2 for several years, and then only when I was dropping it with dry acid as part of a SLAM two years ago. It seems like these rings just aren’t made to last. I’ll have the rings and gaskets replaced next week. If you want to go...

No other growth anywhere in the pool. The pool light ring is a standard Pentair, supposedly solid stainless steel, but Pentair doesn't specify the grade.

Thanks for your thoughts, proavia. The water pH here tends to run high. It's been at 7.8 at the time of opening. I've had to sometimes add dry acid to keep it below 8.0through the season

About two years ago, I had my pool light replaced, and a new stainless steel light and ring installed. Since then I've noticed a steady corrosion of the steel (see photo). I had requested a marine grade (314) ring, but I think the Pentair that was actually installed is only 304. During this...

Thanks for epoxy recommendations, and especially the detailed intructions. Much appreciated!

No evidence of a leak yet... its mostly above the water line so far. I was hoping to fix it to keep it from extending.

This hairline crack appeared in my skimmer throat this year. Its an in-ground pool, with vinyl liner. Every year when I close the pool, I put 1/2 -1 gallon of pool antrifreeze in each throat. Last year I put a bit of pool noodle material in as well. Not sure why this developed (other than its...