Fiberglass salt water pool-black spots

ShrinerManSC

New member
Apr 8, 2020
4
Conway,South Carolina
Hello

We are first time pool owners. We are trying to learn and maintain ourselves. We purchased the K2006C test kit. Our tests seem to be ok

FC-4
CC-0
pH-7.8
TA-120
CH-370
CYA-45

We are looking for suggestions on what appears to be black spots on the bottom of the pool in the deep end (8 ft). I tried to take a picture today, because it is so overcast, it wouldn’t work. There is a pool place we could have our water tested, we would rather do this ourselves. We want to make sure we keep it maintained properly.
Thanks all, we appreciate any and all advice.
 

mknauss

Mod Squad
TFP Expert
Bronze Supporter
May 3, 2014
29,714
Laughlin, NV
Are they pin point spots or large, uneven spots?

Has any copper containing algaecide, shock, etc been used in the pool?