Discolored fiberglass pool walls

PoconoJet

Member
Jul 5, 2016
9
Blakeslee, PA
I have a 12,000 gallon fiberglass pool that had light blue finish when new. Now the pool is about 6 years old and the finish at waterline and below is whitish. In the past I had used metal off and even bought tester to check for iron and copper. The pool has been opened for about 2 months and initially I completed the slam process and now only use liquid bleach. Initially when I did the slam my cya was 0 so I raised to 30 but now is 0 again. Currently my free chlorine this am was 0.5, combined chlorine 0.5, alkalinity 80, calcium 160 and ph was between 7.8-8. Currently I know I need to raise the free chlorine but also need raise the cya. My question is about what to do to try and improve the staining.
 

rmturner54

Well-known member
Jul 6, 2013
555
Waxahachie, Tx.
Thats what i was gonna say☺, u beat me to it. Yoy do need to raise ur cya level and get some chlorine in the pool. If it were my pool, i would raise fc to 10and a modest cya level of 40 to 50, then go from there
 

PoconoJet

Member
Jul 5, 2016
9
Blakeslee, PA
I will have to look into what warranty they have for fading for my pool. Today I did try some vitamin c tabs that I had from before and it did take some of the stain from my water ring / upper walls. In the past I would always use metal off by natural chemistry after using stain off also by natural chemistry and it would help but wall still had white coating / ? Fading. What is the best product to keep metal stains off pool walls?