• Active oxygen reagent tablets for pool photometer — 50 count
  • PoolWaterLAB Free Chlorine reagent tablets (50) for pool photometer testing, close-up of tablets
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DPD N°4 Reagents Tablets (50) – for Pool Photometers

DPD N°4 Reagents Tablets (50) – for Pool Photometers

$13.99 USD
$16.99 USD $13.99 USD
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  • Made in Germany for the US market
  • Item is located in the USA and ships from the USA. Orders ship within 24 hours. Free shipping on orders over $100. To find out the cost of worldwide shipping, simply add items to your cart and enter your shipping details — the rate will be calculated automatically

Which photometers are these reagents compatible with

The reagents are compatible with our entire family of photometers

  • PoolWaterLAB v2.0
  • PrimeLab v2.0
  • PrimeLab v1.0
  • PoolLab 1.0
  • PoolLab 2.0

DPD N°4 Reagents Tablets (50) are photometer-compatible replacement / refill reagent tablets used for accurate pool & spa testing.

Key Specs

  • Product type: Replacement / refill reagent tablets (consumable)
  • Test parameter: Active oxygen
  • Format: Tablet reagent (50 tablets)
  • Shelf life: 2 years (sealed, stored properly)

What this reagent does

DPD N° 4 is a reagent used by compatible photometers to measure Active oxygen. Water disinfected with persulfate-containing media is measured according to the DPD N° 4 method.

Storage & shelf life

Store tablets cool, dry, and sealed. Avoid humidity and heat.

  • Recommended storage temperature: 59-77°F (15-25°C)
  • Protect from: moisture/water and direct heat

Proper storage helps maintain accuracy and supports the stated shelf life.

Material Safety Data Sheet (MSDS) — Download

Note: Product performance depends on correct testing procedure and proper tablet storage.

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