No change in seven days slamming

Cas

0
May 11, 2015
16
Tahlequah, Oklahoma
I have been slamming my pool since May 28th. My water has stayed the same color this entire time, a slightly pea greenish color. I can easily see the bottom. When looking through the water, the top step is white, the next is slightly dingy looking and the bottom two have a greenish cast. I am not losing hardly any chlorine at all during the day and am losing none overnight. Here are my numbers using the TF-100 test kit.
FC-13
Combined C-0
PH-7.2
TA-60
CYA-30
I am brushing and vacuuming the pool daily. I check the FC every couple of hours and haven’t let it drop below 12. I backwash the filter when the pressure goes up 2 points above working pressure. There is no debris on the bottom of the pool. I have had to SLAM for two weeks in years past but when I did I was having to add chlorine regularly so it made sense that my pool was still green. Now my chlorine level stays high with very little being added so I do not understand what’s going on. Any ideas or advice would be much appreciated. Thank you!!!
 
Possible metals in water. You can have a water sample tested at the pool store for metals (ignore anything said, rofl). It's only to see if they are present, not how much.
Are/were algaecides used?
 
I suspect Iron is your main issue. Have you seen any rusty water when you backwash? Put some paper towels in the skimmer and see if they turn brown
 

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