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Curious, a normal range of FC loss during a sunny day, no swimmers, in a 14K gallon pool with CYA of 50. I am full sun. I lose about 5ppm from morning to evening. is this normal?

24' 52" or 54" wall Above ground about 9 years old now. last fall the problem started where I would vacuum and within hours the residue would show up again. it starts showing up on the far side of the pool opposite of the return/intake. its a very light brown almost white, believe to be dead...