Just opened pool and had to add CYA since I drained and refilled just before closing to find and patch a hole. I have the solid CYA in a sock bobbing in front of the return, enough to get the CYA level up to around 30 or so.
A few questions
How long should it take to dissolve?
Also, can I add bleach while it is dissolving?
Lastly I am getting sand from the filter on the bottom of the pool. I have vacuumed a few times and it keeps returning to the bottom of the pool. What can I do to fix or prevent this from happening?