2 dif FC readings - which should I trust?

[Ahshort]

Doing a SLAM. Getting weird readings every 3 hrs. Then realized that I had 2 bottles of Fas dpd. Using one I’m now getting a reading of FC 13. The other gives me a FC of 16, which is my target. I’ve ordered a new bottle but will be a few days. Which reading should I go by til the fresh comes in? Or maybe safer to abandon the SLAM til I’m confident in my testing chemicals?

 

[Mdragger88]

Doing a SLAM. Getting weird readings every 3 hrs. Then realized that I had 2 bottles of Fas dpd. Using one I’m now getting a reading of FC 13. The other gives me a FC of 16, which is my target. I’ve ordered a new bottle but will be a few days. Which reading should I go by til the fresh comes in? Or maybe safer to abandon the SLAM til I’m confident in my testing chemicals?

err on the side of caution & use the lower reading to ensure you’re achieving slam level until your new reagents arrive.
Is one older than the other? If stored properly they have a shelf life of 2 years. They have best by dates on the bottle.
Wait until you get your new reagents to do an
Overnight Chlorine Loss Test