So Overnight Tuesday (to Wednesday morning) you loss 5ppm. Increased to 16, then after 20 hrs tested again Thursday morning it was only a loss of 3ppm. Based on your comments you did not add LC for nearly 20 hrs i.e. Wednesday late morning to Thursday early morning. I cannot see your PM logs (maybe something with the TFP server) so that appears to be progress if some part of that 20 hrs was in daylight. Post a picture of your pool.
Algae, does’t harm you - it just looks bad. You need to keep up the FC at 16ppm by checking every 2 hrs. That will help clear faster.
As well as vacuuming and clearing your filter.
Yes that would be correct that it was 20hrs-ish because it was 16 by around noontime. And yes there would've been roughly 8hrs of sunlight based on the way my house sits.
Just retested (1:30) it's down to 14.5. Added a partial gallon of LC and will check again in 2 hours. Running the vacuum and I think I'll check the filters today as well between vacuum and adding chems. Here is morning picture today and morning picture yesterday.