I service a pool on the east coast of Central Florida and the pool bottom has had these types of lines since I started back in December, with no changes over the past season. Chems are always in good range: chl 3-5, pH 7.6 avg, alk 100, ch 250-500, stab 100 (working to bring this down). I saw a worn down pumice stone on the end of a pole a couple of times and wondered if the customers were scraping it on the floor bottom trying to get rid of the marks, perhaps it has contributed??? Here are some pics:
The marks are around various areas of the pool as well, not just confined to the steps. Could it just be normal wear and tear, use over the past 6-7 years?
Thanks much.
The marks are around various areas of the pool as well, not just confined to the steps. Could it just be normal wear and tear, use over the past 6-7 years?
Thanks much.