Palintest DPD 3 Photometer Test Tablets – 250 Pack (AP031) for Total Chlorine Testing

Palintest AP031 DPD 3 tablets measure total chlorine in pool and spa water using Palintest photometers and DPD 3-compatible test systems. Used after DPD 1 (AP011), DPD 3 allows you to calculate combined (chloramine) chlorine — an essential indicator of water hygiene and disinfection effectiveness. Each pack contains 250 individually foil-sealed tablets.

Key Features

• Tests: Total chlorine (use with DPD 1 to calculate combined chlorine)
• 250 individually foil-sealed tablets per pack — extended shelf life
• Compatible with Palintest Pooltest photometers and all DPD 3-compatible systems
• Part number / Palintest code: AP031

Test Sequence

For a complete chlorine profile: measure free chlorine with DPD 1 (AP011), then total chlorine with DPD 3 (AP031). The difference gives combined chlorine (chloramines).

Compatible Test Equipment

• Palintest Lumiso Pooltest 6 Photometer
• Palintest Lumiso Pooltest Expert Photometer Kit

Related Palintest Test Tablets

Chlorine Testing

• Palintest DPD 1 (AP011) – Free Chlorine, Photometer, 250 Pack
• Palintest DPD 1 Rapid (AT010) – Free Chlorine, Comparator/Rapid, 250 Pack — obsolete, limited stock
• Palintest DPD 3 (AP031) – Total Chlorine, Photometer, 250 Pack — this product
• Palintest DPD XF (AP013) – Extended Free Chlorine, Photometer, 250 Pack
• Palintest DPD XT (AP033/1) – Chlorine, Photometer, 250 Pack
• Palintest DPD Oxystop (AP017) – Removes MPS Interference, 250 Pack

pH Testing

• Palintest Phenol Red (AP130) – pH, Photometer, 250 Pack
• Palintest Phenol Red (AK131) – pH, Comparator Use Only, 250 Pack

Alkalinity Testing

• Palintest Alkaphot (AP188) – Total Alkalinity, Photometer, 250 Pack
• Palintest Alkavis (250F) – Total Alkalinity, Rapid, 250 Pack

Hardness Testing

• Palintest Calcicol (AP252) – Calcium Hardness, 250 Pack
• Palintest Hardicol (AP254) – Total Hardness, Photometer, 250 Pack

Other Parameters

• Palintest Bromine (AP060) – Bromine, Photometer, 250 Pack
• Palintest Cyanuric Acid (AP087) – Stabiliser Level, Photometer, 250 Pack
• Palintest Copper (AP187) – Copper, Photometer, 250 Pack
• Palintest Chloride (AP268) – Chloride, Photometer, 250 Pack

Specifications

• Part Number: AP031
• SKU: RE-AP031/1
• Parameter: Total Chlorine (DPD 3)
• Pack Size: 250 tablets
• Format: Individually foil-sealed tablets
• Brand: Palintest
• Condition: New

Frequently Asked Questions

What is the difference between DPD 1 and DPD 3?

DPD 1 (AP011) measures free chlorine. DPD 3 (AP031) measures total chlorine. The difference between the two results gives combined chlorine (chloramines). Both tablets are used sequentially in a standard pool water chlorine test.

Do I need to use DPD 1 before DPD 3?

Yes. The standard test sequence is to measure free chlorine first with DPD 1 (AP011), then measure total chlorine with DPD 3 (AP031). Subtracting the free chlorine reading from the total chlorine reading gives the combined chlorine (chloramine) level.