I keep getting mustard algae (MA), despite the fact that after my first instance of MA I keep FC relatively high (8.5+) compared to the level on the SWG section of the Chorine/CYA Chart on this site. I maintain pH 7.5-7.8, CYA 60-70, TA 60-80, CH ~300, salt ~ 3100. I've read posts that say CC is not indicative re mustard algae, but in any case CC tests consistently read 0.
When MA does occur, I faithfully follow the SLAM procedure. Usually FC is around 10 and I don't think MA has bloomed at that level or higher, but each time FC dips to around 8-8.5 MA develops.
According to the "It hurts when I do this" -- "then don't do that" advice, that I should therefore keep FC at 10 above, that level seems excessive according to all wisdom I see, so does anyone have any idea why this is happening and what I might do about it?
Thx in advance ...