I use bleach and a Taylor kit for my pool. It is 24 feet around. The pool is clear. The CYA was 5 when I opened the pool. I added 3.5 pounds of stabilizer. I like to keep my cya at 40. My pool gets direct sunlight all day. My Taylor kit is reading the CYA at 30. My local pool store, which just got a new computer for testing, is reading my CYA at 50. Which measurement do I go with so I know how much bleach to add each day? I was thinking of splitting it down the middle and using 40 as my CYA. Thoughts? Advice?