Palintest Phenol Red Tablets


In stock

Palintest Phenol Red Tablets

Palintest Phenol Red Tablets are used to test the pH level in your swimming pool or hot tub.

These tablets are for use with the palintest range of photometers. Please read your user manual to ensure these are the correct reagent tablets.

pH measurement is one of the tests most frequently carried out on water and aqueous solutions. The phenol red indicator method provides a simple colorimetric means of pH determination for neutral and slightly alkaline waters over the range 6.8 - 8.4 units. The Phenol Red pH test is particularly applicable to testing swimming pools and spas.

Palintest Phenol Red Tablets

  • AP130
  • Box of 250
Test Procedure
  1. Fill test tube with sample to the 10 ml mark.
  2. Add one Phenol Red tablet, crush and mix to dissolve.
  3. Select pH on Photometer.
  4. Take Photometer reading in usual manner (see Photometer instructions).

The colour range of the phenol red test is yellow, through orange, to red.
The formation of an intense purple coloration shows that the indicator has
been affected by high chlorine or other disinfectant residuals. In such
cases the result should be disregarded.

Phenol red does not show any further colour change at pH values below
6.8 or above 8.4. Note therefore that when such values are recorded this
could indicate that the sample has a much lower or much higher pH value.

Ionic strength, temperature and other water factors may have an effect on
pH readings. This test has been calibrated for conditions most likely to be
encountered in a typical swimming pool at 30°C.

Other reagent tablets for Palintest Photometers

For Free chlorine levels use Palintest DPD No.1 Tablets

For total chorine levels use Palintest DPD No. 3 Tablets

Download your Pool Chemistry Guide


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