i finally got my water tested at a pool store and the cya shows 0, chlorine is 1.0 everything else was okay except hardness and they said i need to add 30 lbs of balance pak 300, which im not going to do unless you tell me otherwise. i have a vinyl liner. i am going to add the balance pak 100 to increase the cya. the pool store says to add 9 lbs...i have 21,000 gallons of water. is this the correct amount? also you all instructed me to put the stablizer in front of the jets in tube socks, should i still do this, or do i need to add in the skimmer since my reading is a lot lower than i thought? please let me know what to do. thank you