I meant 2lbs. of granular CYA. If you decide to use this, you can either pour it directly into the skimmer to dissolve in the filter. Keep the pump running 24/7 for the first 4 or 5 days after that and do not backwash during that time. Another way to add it is to put it in an old sock and hang it in front of a return jet. If you give it a squeeze once in awhile it will help it to dissolve faster.

But, if you have dichlor, you can use that instead of the granular CYA and it will add CYA as it chlorinates. However, if you do use the dichlor, know that it adds CYA fast so you'll need to monitor it. For every 10ppm of chlorine that it adds, 9ppm of CYA is also added. It is also acidic and will drive your pH down so that will need to also be watched.