is this product interchangeable with Hach 2105569?

I don't believe so. The Hach 2105569 takes a 10ml sample and is best used in a Hach machine. The Barnant 1407799 takes a 5ml sample and is used in the Hach visual measurement kit. I use a Hach visual kit with the Barnant 1407799.

Can these reagent pillows be used in another colorinator that is not the Hach brand? I have a Hanna free-chlorine chlorinator coming.

It could be considered but we cannot confirm they will give the correct result. If you want to try it, it would be best to do so with a known solution of chlorine or side by side comparing results to the proper manufacturers reagent.

what is the difference between "free" and "total" chlorine?

Free chlorine is the amount of non-reacted available chlorine in a system. Total Chlorine is the amount of compost chlorine in a system including free chlorine, and reacted chlorine like chloramines.

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DPD Free Chlorine Reagent Powder Pillows, 5 mL, Pack of 100, 1407799 | Range 3.5 mg/L Cl₂, USEPA Accepted Method 8021, Drinking Water & Wastewater Analysis, For Use with Colorimeter

Product ID: 23993764

Details

Brand
HACH
Item Form
Powder
Item Weight
0.02 Kilograms
Package Size Name
100-Pack
Product Benefits
Maintains

📏3.5 mg/L Cl₂ Accurate Range

📦100 Pre-measured Powder Pillows

🧪USEPA Certified Quality

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Description

💧 Stay ahead in water safety with precision you can trust!

EPA BACKED PRECISION - Trust your water analysis with USEPA accepted Method 8021 for unmatched accuracy.
VERSATILE WATER TESTING - Ideal for groundwater, municipal, and surface water analysis—stay ahead in environmental monitoring.
READY TO USE CONVENIENCE - 100 pre-measured powder pillows streamline routine testing—no guesswork, no mess.
OPTIMIZED CHLORINE DETECTION - Confidently measure free chlorine levels up to 3.5 mg/L for safe, compliant water quality.
SEAMLESS DEVICE COMPATIBILITY - Perfectly engineered for Hach colorimeters and spectrophotometers to deliver reliable results every time.

Hach DPD Free Chlorine Reagent Powder Pillows (Pack of 100) provide EPA-certified, precise chlorine measurement up to 3.5 mg/L using Method 8021. Designed for seamless use with Hach colorimeters, these pre-measured powder pillows simplify routine water quality testing across drinking water, wastewater, and environmental applications.

Specifications

ASIN	B00N3YJBHS
Best Sellers Rank	#42,425 in Industrial & Scientific ( See Top 100 in Industrial & Scientific ) #46 in Analytical Reagents
Brand Name	HACH
Customer Reviews	4.6 4.6 out of 5 stars (90)
Item Form	Powder
Item Weight	0.02 Kilograms
Manufacturer	HACH COMPANY
Manufacturer Part Number	1407799
Model Number	1407799
Number of Items	1
Package Size Name	100-Pack
Product Benefits	Maintains Clean Sanitized Water
Unit Count	1.0 Count

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10108 som

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In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

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