In addition to my many other issues- I also have gotten a crazy amount of CYA in my pool. I am doing a partial drain, but i am also going to try and control what is going in this year. After talking with the pool store in depth they told me that the biogard burnout 35 does not have the CYA I just want to confirm this to be true. We have been doing bi-weekly shocks 1 time with that and 1 time with super sol. I am thinking of switching to do one of the shocks with liquid. I have a 25000 gallon pool how much liquid would I need? I was thinking 4 gallons per shock. This is assuming I get my CYA down to about 60. DOes all of this sound correct?