I've been a reader of this forum for quite a while and I really appreciate all the help and time everybody puts forth to help people like me.
I have been having a lot of trouble with my pool keeping FC above 0.5.
I had a white mould problem (tissue paper mould etc) earlier this year and I can't seem to get rid of it. It is under control and the water is blue and clear except for build up over time on the floor of what looks like brown particles which I can vacuum and clean.
I purchased the testing kit and my specs are below. I know my TA and pH are low and I am adding baking soda and soda ash to bring them up.
The real problem is yesterday I dumped 4.5lbs of Cal-Hypo 68% to get the FC to 16 to try and shock the pool. This was based on the chart on this forum for a CYA of 45 and used the pool calculator. Later last night I checked the FC and it was again 0.5, although CC had dropped to 1.5. I then added 382 oz of 6% liquid chlorine and immediately checked the FC which was around 4. I assumed it wasn't higher because it needed time to circulate.
This morning the FC is again 0.5 ppm.
This is not the first time I cannot hold FC above 0.5 ppm.
I do not want to keep adding more chlorine but I am at a loss.
Side note, when I add the Cal-Hypo I get a fair amount of brown silt forming. This did not happen with the bleach. I don't know what this is. My CH seems ok but I am new at this.
Thank you in advance for any thoughts advice or help, and I apologize if this has been answered already.
Pool test results: