I started getting my pool ready for the season on Sunday. I knew that I had very low CYA levels, so I brought it up to a shock of 15. I've kept it up there since Sunday morning. The pool is blue (was light green when I started), and somewhat cloudy today, but not too bad. I went and got some CYA today, and I'd like to add it today.
So, my question is, my shock level was only 15 because my CYA level was so low. If I add CYA to get up to about 40, should I then raise my shock level, also, or will the CYA take so long to get into the water that it won't matter by that time (I know it takes up to a week for the dry CYA to register on the tests). I'd like to maintain my shock for at least today, and test overnight, to see if I need to continue with my shock levels. I just want to make sure I'm at a high enough shock level after I add the CYA.
Also, what is the best way to add the CYA? I remember reading something about someone putting a nylon sock in front of the filter maybe (?) but I can't remember the details. I tried to get a liquid CYA, but the pool store guy flat out told me there was no such thing (whatever). I then stood in line and listened to another employee tell a guy buying chemicals that "you can shock all you want, but chlorine will never get rid of the algae." Lol! I felt bad for the customer.
Thanks for the info, guys!