- Aug 5, 2013
- 219
- Pool Size
- 12000
- Surface
- Plaster
- Chlorine
- Salt Water Generator
- SWG Type
- Pentair Intellichlor IC-40
For this season I have something black on my [horizontal] walls. I've SLAMed twice and done the OCLT twice which came back 0ppm and 1ppm respectively. I wire brush these areas at least once a day and nothing ever changes. The areas have probably doubled since February, when I first noticed them. The filter has been cleaned and recharged.
Last Test:
FC: 7.5
CC: 0
TA: 110
CH: 400
pH: 8
CYA: 45
NaCl: 3000
I know the CH is high but this is pretty much what comes out of the tap here in Phoenix, AZ. Area is not raised or slimy - feels like rest of pebbletec. Almost seems like it is the plaster, which is normally a brownish color.
On bottom step in corner with a little up on second step:
Last Test:
FC: 7.5
CC: 0
TA: 110
CH: 400
pH: 8
CYA: 45
NaCl: 3000
I know the CH is high but this is pretty much what comes out of the tap here in Phoenix, AZ. Area is not raised or slimy - feels like rest of pebbletec. Almost seems like it is the plaster, which is normally a brownish color.
On bottom step in corner with a little up on second step:
