I bought a FAS/DPD refill for my TF-100 kit. I took chlorine readings with the old bottle of drops and got a reading of 3FC. Took it with the new drops and got a reading of 5FC. Re-ran the tests again with no change. Which one is right?
frogabog said:Go with the new stuff. If new reagents are different, obviously the old stuff is bad.
Which is weird... since there was a recent report about old reagents testing 2-3 times high. I'd think old/bad reagents would test low like you're seeing vs testing very high personally.
duraleigh said:The R-0871 is light sensitive which is why it's in the opaque bottle. I'm not sure if that's helpful, though, because I don't know what happens after it has been exposed to light.