Re-read your thread again very carefully and want to emphasize a few things now that you've been at this for 9 days now:
- The CYA test is absolutely critical. If you are confident in that CYA of 30 - great. If you have any doubt about the black dot disappearing and when, re-test and have a friend look and try it as well. You can pour the same solution back & forth as much as you want to get a good average. If it's below 30 you lose FC to the sun and hamper your SLAM effectiveness. If it's higher than 30, then your FC might need to be higher. Make sure to test CYA outside under a bright sun - sun at your back. I just had to emphasize that one.
- Next is the debris. If you have any large/bulk debris in the water, it must be removed. It will significantly slow-down your FC's effectiveness to clear the water. You can use a rake and any variety of pool netting products, but you have to keep working to ensure you have as much bulk debris removed as possible.
From there it's all about maintaining the FC with the current CYA. Pump on 24/7, sweeping/brushing, backwashing, etc. If you do a lot of backwashing, it could eventually lower your CYA, so be aware of that as well. All of these things work together during the SLAM - to include possibly having to deep clean the filter. But there is no mistaking that the bleach (chlorine) WILL kill algae and clear water when these processes are maintained.
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Not sure if anyone mentioned this before ... but if you have a ladder or light in your pool, algae can/will grow inside or behind those items. It's always best to inspect really well. Remove the ladder if you have one, and look behind the light in the light niche if you have one of those as well.