I don't believe the test kit you have includes the FAS-DPD chlorine test that you need to measure higher FC levels required for SLAM. One can be ordered from tftestkits.net.
By not adding enough chlorine, you are playing patty cake with the organics in your pool. They will play that game with you forever. It's only when you hit them with a constant sledgehammer (FC 28) that you can successfully clear your pool.
Reread the SLAM article......you are not doing it yet.
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