Pentair Rainbow 752 2-in-1 Chlorine & pH Pool Water Test Kit | R151076

The Pentair R151076 Rainbow 752 2-in-1 Pool Water Test Kit provides a convenient way to monitor chlorine and pH levels in swimming pool water. Featuring an easy-to-read color comparator, two liquid testing reagents, and a durable blue hinged carrying case, this testing kit is ideal for routine residential pool maintenance.

The Rainbow 752 uses OTO Solution #1 to measure approximate chlorine levels and a pre-blended pH indicator to help determine swimming pool water pH.

Designed for straightforward testing, the kit helps pool owners monitor important water chemistry conditions and make informed decisions about pool maintenance.

Product Features

• Genuine Pentair Rainbow Test Kit: Original manufacturer water testing equipment.
• 2-in-1 Water Testing: Tests chlorine and pH using liquid reagents and a color comparison method.
• OTO Chlorine Testing: Includes 0.5 oz of OTO reagent for approximate chlorine testing.
• Pre-Blended pH Reagent: Includes 0.5 oz of pH testing solution.
• 0.3–3.0 ppm Chlorine Range: Provides a color scale for monitoring chlorine within the kit's specified testing range.
• Blue Hinged Carrying Case: Keeps the comparator and reagents organized.
• Easy-to-Read Comparator: Allows users to compare water sample colors against calibrated reference scales.
• Replaceable Reagents: Compatible replacement testing solutions are available separately.
• Routine Pool Maintenance: Convenient for regular water chemistry monitoring.

Product Specifications

• Manufacturer: Pentair
• Brand: Pentair Rainbow
• Manufacturer Part Number: R151076
• Distributor Part Number: RAI-45-829
• Model: Rainbow 752
• Product Type: 2-in-1 Pool Water Test Kit
• Testing Parameters: Chlorine and pH
• Chlorine Test Method: OTO Color Comparison
• Chlorine Testing Range: 0.3–3.0 ppm
• pH Test Method: Liquid Color Indicator
• OTO Reagent Size: 0.5 oz
• pH Reagent Size: 0.5 oz
• Carrying Case: Blue Hinged Case
• Application: Swimming Pool Water Testing
• UPC: 788379001926
• Selling Quantity: 1 Complete Test Kit

What's Included in the Pentair R151076 Test Kit?

The Pentair Rainbow 752 includes the essential components for routine chlorine and pH testing.

• One 0.5 oz Bottle of OTO Solution #1: Used for approximate chlorine testing.
• One 0.5 oz Bottle of Pre-Blended pH Reagent: Used to determine swimming pool water pH.
• Chlorine and pH Color Comparator: Provides reference scales for interpreting test results.
• Blue Hinged Carrying Case: Protects and organizes the testing components.

Chlorine Testing with OTO Solution

The Rainbow 752 uses Orthotolidine (OTO) reagent to provide an approximate total chlorine reading.

When the reagent is added to a properly collected pool water sample, it produces a yellow color reaction.

The intensity of the yellow color is compared with the chlorine reference scale to estimate the sanitizer concentration.

The kit measures chlorine over a specified range of 0.3 to 3.0 parts per million (ppm).

Testing Limitation: OTO testing does not separately measure free chlorine and combined chlorine. For those individual measurements, use a compatible DPD or FAS-DPD chlorine test kit.

Swimming Pool pH Testing

Maintaining appropriate swimming pool pH is important for water comfort, sanitizer effectiveness, and protecting pool equipment.

The Pentair Rainbow 752 includes a pre-blended pH indicator solution used with the kit's color comparator.

After adding the specified reagent drops to a pool water sample, users compare the resulting color with the pH reference scale.

Routine pH monitoring helps identify conditions that may contribute to scaling, corrosion, or swimmer discomfort.

Why Regular Pool Water Testing Matters

Swimming pool water chemistry can change due to sunlight, temperature, rainfall, swimmer activity, and chemical additions.

Regular testing helps pool owners monitor water conditions and maintain an effective maintenance routine.

Benefits of Routine Testing

• Monitor swimming pool chlorine concentration.
• Check pH levels for water balance.
• Identify changing water conditions.
• Support effective sanitizer management.
• Reduce the likelihood of scaling and corrosion.
• Help maintain comfortable swimming conditions.
• Make more informed chemical adjustment decisions.

How to Use the Pentair Rainbow 752 Test Kit

1. Collect a representative swimming pool water sample according to the test kit instructions.
2. Rinse the comparator test chambers with pool water.
3. Fill the test chambers to the designated water levels.
4. Add the specified number of OTO reagent drops to the chlorine testing chamber.
5. Add the specified number of pH reagent drops to the pH testing chamber.
6. Mix the samples according to the manufacturer's instructions.
7. Compare each sample color against its corresponding reference scale.
8. Record the chlorine and pH readings.
9. Rinse and dry the comparator after testing.
10. Return the testing components to the blue carrying case for storage.

Important: Always follow the instructions included with the test kit for the correct water sample volume, reagent dosage, and reading procedure.

OTO vs. DPD Chlorine Testing

Different swimming pool testing kits use different methods to measure chlorine.

• OTO Testing: Provides an approximate total chlorine reading through a yellow color reaction.
• DPD Testing: Can measure free chlorine and, with the appropriate additional reagent, total chlorine.
• FAS-DPD Testing: Uses a titration method for more precise free and combined chlorine measurements.

The Pentair Rainbow 752 is intended for straightforward chlorine and pH testing. Additional testing equipment may be necessary for comprehensive pool water analysis.

Related Pentair Replacement Test Reagents

Aqua Pool Supply carries genuine Pentair replacement reagents for maintaining compatible pool water test kits.

• Pentair R161025 – OTO Replacement Solution, 1 oz – Replacement OTO reagent for compatible chlorine and bromine color comparison test kits.
• Pentair R161126 – pH Test Reagent, 16 oz – Larger replacement pH indicator solution for compatible Pentair pool testing equipment.

Additional Pool Water Testing Products

Explore Aqua Pool Supply's Replacement Test Reagents collection for chlorine, pH, alkalinity, calcium hardness, and other testing solutions.

Test Kit Care and Storage

• Store testing reagents in their original bottles.
• Keep the kit away from direct sunlight.
• Avoid exposing reagents to excessive heat.
• Keep reagent bottles tightly closed.
• Prevent contamination of the dropper tips.
• Rinse the comparator after each use.
• Replace expired or deteriorated reagents.
• Store the kit away from children and pets.

Package Contents

Includes: One (1) Genuine Pentair Rainbow Model 752 2-in-1 Chlorine and pH Water Test Kit with Blue Hinged Case.

Testing Solutions: Includes one 0.5 oz OTO reagent and one 0.5 oz pre-blended pH reagent.

Selling Quantity: One complete test kit.

Important: This kit measures chlorine and pH only. It does not include reagents for testing calcium hardness, total alkalinity, or cyanuric acid.

Safety: Testing reagents contain chemicals requiring careful handling. Follow all manufacturer label instructions, avoid contact with skin and eyes, and keep away from children.