Seeking guidance from community. We have very hard water here, TDS in 2-yr-old pool water now 802ppm. Fresh in tap (private well) is 245ppm. Post water-softener (Lithium salt) 297ppm. Somewhere I read that high TDS makes chlorine less effective. Is this correct? FC, TC, CYA, pH consistently all within range, yet I cannot get ahead of mustard algae, much of it clinging to walls and in calm water. Is this more a TDS problem than of chemical balance?