Richard. I feel like you departed from the "let it settle until the top clears" plan by brushing, dropping a barracuda in, and tinkering with the deep end before you could clearly observe the drifts. etc.
If you're simply choosing a different route than the one that I'd advised, that's fine, I'm happy to circle back when the water is clear to help you address the metals.
And again, perhaps with Summer heat you'll simply wouldn't get the results I did my way when the water and air temps were colder.
But if you WERE trying to get visibility in the deep end and do a single, comprehensive vac to waste, the putting the barracuda in or otherwise disturbing the depths was counterproductive until you can see clearly enough to get the majority of it. And if the water is still cloudy, more debris will keep settling.
In other notes:
- Your picture certainly looks like incorrect or otherwise altered sand to me, and it does not look like mustard algae. I think PA girl is right. In which case, letting it settle is paramount.
- Your water may be green from oxidized metals which you cannot clear until your slam is finished. We will only be able to dx that remotely by you passing the
Overnight Chlorine Loss Test and still having green tint or clearing the cloudiness and still having the green tint.
- RE SLAM level... the tile line of your liner is already fading from presumably before you started using the more modest TFP slam levels. Every time you exceed mustard shock level, you're risking your liner. Its your call to go higher, and it is your liner, but we cannot recommend it in good faith and risk the unintended consequence of damaging your liner. This has been consistently expressed by multiple posters so please don't ask us to make that kind of recommendation. It would not be ethical of us to do so.
Lastly, I don't have a good meter to measure this by now with the water action today, but if clarity does not dramatically improve by say the weekend, you may wish to consider using your shop vac to remove your new sand to carefully check/inspect the laterals for cracks or a loose fit from when you changed the sand. I believe INYO pools as a "how to" video on this if you need to look it up. Because it HAS been clearing, albeit slowly, I'm inclined to this this may be unnecessary.
Cheers to clear