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Just finished treatment for mustard algae in my fiberglass pool and about a week later this starts to appear It disappears with a light brush Any ideas please

I’ve treated the pool for mustard algae but not 100% sure I’ve got it My free calorie levels haven't change over night Can I assume I’ve treated it ?

Maybe a daft question Are calcium and calcium hardness the same thing Having trouble locating a hardness test but can get a calcium test

Hi folks Have noticed white specks on my fiberglass pool walls below the water line more pronounced at the corners These are not raised and won't scrub or scrape off The pool is only 5 months old Have posted some pictures Has anyone had the same thing like this? If it is gel coat breaking...

Hi Folks hope some one can assist with this PH is testing of scale (Taylor test I think) With 4 drops phenol red reads max at 8.2 add the 5th drop and turns blue/purple TA is now at 30 down from 90 Have had this reading (pH) last 4 times I've tested and have added recommend Acid 165 ml each time...

Thanks for allowing me to join this site I am retired and now living in Thailand. Have recently installed a saltwater fiberglass pool and have she questions about establishing the correct PH and TA Regards Jim