I'm hoping someone can help, I have white flakes in my hot tub water. I carried out some research online and everything points either to calcium deposits or white water mould.
I am fairly confident that they aren't calcium or scale deposits as I have tested for this by leaving a sample containing flakes in a jar overnight in a very acidic solution which was less than 6.2 (that's the lowest my test strips go), but this has not made a difference. Also the shell of my spa isn't rough.
I also don't think they are organic as I have left some in a jar over a period of 3 days now in a highly chlorinated solution (well over 10ppm) and it has made no difference whatsoever.
The flakes are white (no yellowing), no bigger than 5mm across and are super thin, they break easily and are brittle rather than mushy.
I have drained out and refilled the hot tub a couple of times, and cleaned out the filters. We took the panel off the side and some of the clear pipes look white and cloudy - could the flakes be material that has broken away from the pipes?
Any suggestions gratefully received as I am quite stumped!
NB I have tried using a pipe work flush and this didn't work either.
Thanks in advance!