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OK, I've found out that the pH is 6.5 or a bit lower. Also the people at the pool store just told my dad to drain the pool about 1/3 and that should get rid of the copper in it. Will it be safe to use after the draining and can someone tell me what chemical reactions were really going on with the chlorine and water?

I am located in Trinidad. I don't think I have a water test sample thing but my dad might have bought it and never used it, I will check. So you're saying that the algaecide is what introduced the copper into the water? Then how do I get rid of the copper in the water and why did the stains just disappear? Is the water safe to use? Please post the theories you think are the most plausible with what little information you have right now while I try and get more information in about the pool and the water. UPDATE: My dad says that it is cement but there's something over it though, he didn't remember the name but it was something like "StarBright" or something like that, he can't remember.

Honestly at waterbear, I have no idea. I just clean the pool the way my dad told me and I've been doing it like that for years and this never happened. Anyway I found out what I could: We use: Clear Swim Unstabilized Granule Chlorine Clear Swim Stabilized Chlorine Tablets Pool Blocks - All Season Algaecide This is the order of how cleaning the pool would go: Vacuum the pool Backwash Rinse Take leaves etc. out, clear filter basket, put chlorine tablets/pool blocks into filter basket, throw granule chlorine into pool Start the pump to filter again So what happened was I followed that procedure above and after leaving the pool for a while and seeing it again the parts where I threw the chlorine and where it fell to the pool floor were purple-black. The weird thing is that after a day it just disappeared. The pool went back to normal, even when we tried to sweep the areas affected, it wouldn't come off then the day after it just vanished. I really just want to know whether the pool is usable or not and what happened. It didn't look like the picture provided it was a really dark colour. Thank you so much for the help! Note: I don't think anything is wrong with the chlorine, we've been using the same brand for years plus I used some from the very same bucket like twice before this incident and nothing happened. I did read about the metals in the pool, but how would the water just get a lot of metal randomly after nothing changed? That's what I'm confused about.

Hi there First off Merry Christmas/Happy Holidays to anyone who reads this! Anyway, I was just cleaning my inground swimming pool and finished it off with some pool chlorine dust. I left after I finished to bathe and whatnot and happened to walk by the pool again and saw that everywhere chlorine was thrown had turned purple/black! I tried to sweep it off but it's like fused with the ground! Any information on this strange occurrence would be helpful! I've been cleaning my pool for more than 7 years and never encountered or witness anything like this! How do I fix this!? Thank you for the help!