How much CYA?

Hi there frustratedpoolmom! I FINALLY got my Taylor FAS-DPD test kit. (I was on another thread but came here for CYA info). I just tested my water. I get zero pink. I didn't go any further bc I didn't think I had to after that. Do I? The algae issue is still present but not bad. In fact, it's pretty slight. BUT...I've been super chlorinating in the interim of receiving my kit. Apparently, the chlorine isn't holding. If I understand correctly, I have to get the chlorine to hold BEFORE adding CYA. Is it time to SLAM? (I apologize I haven't yet added my info at the bottom. I will do so.) I have a 25K gallon (40x22) pool, pebble tec plaster, Raypak heater, Waterway pump, (just removed the Zodiac mineral cartridge cannister this year...it cracked over winter and I decided to nix it, it was 14 years old). Thank you much! Teresa
 
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