Hey JB!
![Wave :wave: :wave:](/images/smilies/wave.gif)
Just checking in. Looking back at that last pic from the 9th, woo, that was still pretty green. Your test numbers look very good, so that leaves us with the following thoughts:
- Chlorine kills algae, but it has to be proportionate with the correct CYA which you appear to be doing. So the only other "unknown" is what might be in the water (solids). Chlorine will break down algae spores and such, but larger material will take weeks or months. So it is extremely important ensure there is nothing tucked away in some spot down under. Main drains, steps, ladders, large light niches, etc are havens for algae.
- Water circulation is critical as well which is why the pump is on 24/7. But check to ensure the water "pull" at the skimmer and returns jets are all flowing well.
- I think I asked this much earlier in the thread, but I don't want to lose my place while typing …. but if you are on a well, that can impact the color hues, but should eventually clear, even if it has a pretty green or tea color.
- As best as we try from our computers, we're not there so sometimes something impacts the SLAM we just don't know about. In some cases, a healthy water exchange is required because of previous chemicals added or simply to help the owner see lower into the pool and discovering something hidden (growing). Earlier this season an owner decided to drain only to find a deer carcass in the pool. The SLAM would not have been able to overcome that one.
- If you are confident about the CYA at 50, then an FC of 20 is good. More won't help. If you find the CYA to be closer to 60, then you can increase the FC to 24. Other than that, it's a lot of brushing, vacuuming, backwashing, and time.
We'll be watching to assist as we can.