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Pentair’s 2025-2026 maintenance catalogue lists item R161025 as “OTO Solution No. 1, 1 ounce” — a replacement OTO reagent for Pentair Rainbow drop test kits. Pentair states that test reagents should be replaced annually to guarantee reliability.
| Product Code | R161025 |
| Manufacturer | Pentair (Rainbow) |
| UPC | 788379743048 |
| Manufacturer Description | OTO Solution No. 1, 1 ounce |
| Bottle Size | 1 oz. |
| Type | Replacement / refill test reagent |
Pentair states that its test kits are manufactured under strict quality control by certified chemists, and that to guarantee reliability test reagents should be replaced annually.
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