New to TFP and totally clueless! Black stains trying to figure out
- Thread starter Twinmommy0310
- Start date
Welcome to TFP!!!Well, going to take some investigation to figure out what they are.
Do they brush off at all?
If you put some crushed up vitamin C on them for a few minutes do they lighten?
If you put a tirchlor tablet on them for a few minutes do they lighten?
Thank you for responding and the warm welcome :hockey: when I brush nothing comes off. I haven't tried those tablets yet or the vitamin c. Just learned about those from this forum 
I will have to give that a try. The placements of these stains are very strange. Typically that's where the leaves rest. There's also a few spots on the side of the pool too. I did have elevated copper as the stairs were brownish but added some metal remover and it cleared right up. Ph is currently 7.8 and FC is 2. I have a saltwater system that is going on 4 years old.
I will have to give that a try. The placements of these stains are very strange. Typically that's where the leaves rest. There's also a few spots on the side of the pool too. I did have elevated copper as the stairs were brownish but added some metal remover and it cleared right up. Ph is currently 7.8 and FC is 2. I have a saltwater system that is going on 4 years old.Wanted to update. I tried the chlorine tablets and they worked. Lifted the stains right up on the test areas. I have my new test kit coming early next week (TF 100 and speed stirrer). After testing I'll up my FC to whatever % is needed based on CYA results. Do I need anything else? (Besides constant brushing). I'm still confused on liquid chlorine vs household bleach. You really put bleach in the pool? Why does that scare me (unlike the pool store stuff I didn't think twice about)?
- May 3, 2014
- 59,128
- Pool Size
- 6000
- Surface
- Fiberglass
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
Liquid chlorine and bleach (plain, non splashless, no scent, no Cloromax) are the same, Sodium Hypochlorite.
So the stains must be organic. Run your FC a little higher and brush a bunch and they should go away.
Possibly black algae? (you mention leaves sink to these spots)
Marketing =) Because Liquid Chlorine/Shock "says" to use it in the pool, Household/Cleaning Bleach is in the cleaning section =)
