pH Phenol Red Taylor reagents R-004 and R-0014


LifeTime Supporter
Sep 6, 2007
I ran out of my Taylor R-0014 ph phenol red indicator reagent, went to pool store and they only had R-004. I've been using R-0014 for years with my original Pool Solutions test kit and refilling as needed when running out. When I used the R-004 reagent, the resulting color was WAY more red/purple that I've ever seen and my pH was off the charts and dark purple. I've never seen that color.

Quite confused right now. Not sure if my pH is really that high or I'm using the wrong reagent.


LifeTime Supporter
May 23, 2007
Montreal Canada
Wrong reagent. R-0004 is used with the 9056/9058 blocks (44 mL sample), it has a different concentration than the R-0014, used in the smaller blocks found in the K-1000 series test kits.


TFP Expert
Platinum Supporter
LifeTime Supporter
May 7, 2007
Silver Spring, MD
Try only using 1 or 2 drops of R-0004, instead of 5. That will give results closer to R-0014. The concentration is different, so the saturation of the color will be different, but the shade of color will still be the same as it would be otherwise, and you ought to be able to match it up with the color chart.


Well-known member
Aug 3, 2011
Man I love this forum --- you guys have answers to everything.

I gotta get some more R-0014 tomorrow myself, hopefully Leslie's has it.

For next season, I'm getting the TF-100 though. :)