Ensure accurate total alkalinity readings with the Pentair Solution #5 test solution (R161203). This ½ oz bottle is made for use with Rainbow test kits, helping maintain balanced and healthy pool water.

Key Features:

Genuine Pentair reagent solution #5 for total alkalinity testing
Compact ½ oz bottle—ideal size for test kit refills
Designed for use with Rainbow test kits such as No. 78, 7000 Series, Pro 11, and similar models
Delivers reliable, accurate coloring for pH buffering capacity analysis
Cost-effective replacement to keep your test kit ready for precise readings

Product Overview:
The Pentair R161203 Solution #5 (Total Alkalinity Test) is an essential refill reagent for Rainbow water test kits. Its ½ oz bottle size is convenient and maintains accuracy for measuring alkalinity, ensuring your pool or spa remains properly balanced. Compatible with a range of Rainbow kits—including No. 78, 7000 Series, Pro 11, No. 761, No. 782, and No. 783—this solution is perfect for routine water chemistry checks and long-lasting performance.

Pentair | R161203 | Solution #5 Total Alkalinity Test – ½ oz Replacement Reagent