CYA Level

[djg9100]

I have read posts about High CYA causing some cloudiness, etc. Pool looks great during day and pretty good at nite. Notice a lot of particulates at night when light is on and especially near the light. High C2 pool with CYa levels at 150-180. Is is advisable to use a water clarifier, specifically Leslies "ultra bright" to remove some of whatever this is??CYA 150 ish, FC 9, CC 1..

Thanks for commentary

[Watermom]

If your numbers are right, then it appears that you are fighting something in the water. Anytime the CC is over 0.5ppm, you should shock the pool. Use the levels in the chart I linked above and shock the pool and maintain the high chlorine until you can meet three criteria:
1) You lose no more than 1ppm of FC overnight from sundown until within one hour of sunrise the next morning
2) You have no more than 0.5ppm of CC
3) Your water is clear.

Then, hold the chlorine high for one additional day and then let it drift down and keep it within the minimum/maximum range based on your CYA level.

[djg9100]

ok to use the hypo-chlorite granules 73% or will this cause other issues?

[BigDave]

Calcium hyochlorite will build calcium hardness in the pool. I don't see a CH value in this thread; temperature, TA and pH are also relevant. Would you please provide these readings?