I tested my water on Wednesday at a PH of 7.8 and added acid to lower it to around 7.6. On Saturday, I'm expecting it to be around 7.8 again and took a water sample to a local pool store that I trust, mainly to test the CYA level, since I ran out of reagent(mistakenly dumped it out, AGAIN).
The pool store tested my ph at 8.2. All other chemicals tested seemed consistent with mine. I couldn't believe that my PH was so high, so when I got home, tested it at 7.7! How could it be so far off? I wasn't watching him too closely as he did the test, but remember him showing me how pink the sample was. My sample at home was light pink. I remember this happening the last time I took a sample to the store.
I'm using the Taylor test kit that comes in the TF-100 test kit, but I'm not sure what type the store uses, although I know it's a drop test kit with a bigger, plastic container with 4 seperate columns for water. Does anyone else experience that same inconsistencies? Could his test kit be more accurate than mine? I can see maybe a .2 difference, but a .5 I just can't see.