Ok, some more info. Chlorinator 80% and a lot of calsium blocking. Salt 3.2. I have put in a "puck" of chlorin when the earlier one just gone. I do that because I think that should keep black algeas away. Some months ago I slammed the pool several times. I have had black algeas about 2 year.
www.troublefreepool.com
My idea was not to kill algae, it was to hold FC high about 5, to stop algae to start to grow.. I am surprised that FC can be so high when salinity is low, chlorinator only 80% and a lot of calcium clogged in the chlorinator. But it seems that the chlorine pucks gives a lot.If you are currently trying to kill algae, then it makes sense the FC will be elevated. The FC should be at the correct SLAM FC level based on your current CYA as noted on the FC/CYA Levels. So you go to the SLAM tab, find your CYA first, then find the FC level you should be at for the SLAM Process. If your FC is higher than that SLAM FC level, then yes, you should reduce the amount of chlorine produced.
Black Algae
This guide provides a step by step procedure for eliminating black algae in your concrete or gunite pool. Read full post here.
Why two scoops? According to the instructions, and this video, it should only be one scoop of R-0870. Not sure what 2 scoops will do to the test results, but curious what the test result would be if you used one scoop...
It’s a ‘heaping’ scoop. Some do 2 level scoops and others make a powder snowball instead. Any extra doesn’t mix and stays grainy in the vial and shouldn’t affect the testing.
Your video shows kit TF100, I used K-2006, which say 2 scoops. Bur in the future I will use 1 scoops, result will be the same and I save powder
