I get mild tan colored staining on my fiberglass pool. I use citric acid which works fine and have tried a few different metal treatments with limited success. Probable pool boy error (that be me). I've been reading several threads and listen to what you guys have to say. I haven't mastered the metals issues, YET! I have well water but haven't had it tested yet. From what I read, testing pool for metal can be hit or miss. My pool is under roof so no rain water in pool so all add water is from well. I came across some products by Hydro Pure Tech.
1st- "Metal trap" filters to remove metals from fill water. They also say you can recirculate pool water through the filter with a submersible pump to remove metals. They say it has a special media. Sounds like a good idea to me.
2nd- "Pool Refresh" is a new 2 part product that claims to drop metals to the bottom to be vacuumed and/or filtered out. Its not on their website yet but I found it on askalanaquestion.com. Its about $80+ to treat 10k gal.
3rd- "Liquid Metal Trap" which "alan" says is a "true chelating agent" which he says I need. I've seen the sequestran vs chelatant threads. All kinds of retail claims out there.
My pool is balanced but the calcium is around 110. I read somewhere that stain is less likely with a higher 200 CH.
I'm trying to find a way to use less sequestrant/chelatant. The once a month or bi weekly maintenance doses don't seem to work. I may not have enough initial dosage or need to use more for maint. Maybe I need to look for a test for sequestrants.
I've heard from Jason and Pool Geek on previous post's and I thank you.
Thanks for any opinions.