pH Probe KCl Storage Solution by Bluelab — Keep pH Probes Hydrated & Accurate
BL-SOL-KCL-120ML
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Pairs well with
Bluelab pH Probe KCl Storage Solution is what keeps a pH probe alive. Every Bluelab pH pen and probe stores wet — the glass tip sits in KCl solution between uses, and a probe left dry drifts, slows down and eventually dies for good. This is Bluelab's own laboratory-grade solution, made specifically for their pH pens and probes, to keep response fast and readings accurate for the life of the instrument. Available as a single-use sachet or in 120ml and 250ml bottles.
Specifications
KCl (potassium chloride) pH probe storage solution
Single-use sachet, 120ml bottle, 250ml bottle
Bluelab pH Pen, Soil pH Pen, pH Probes, Soil pH Probes
Storage and hydration — increases response speed, maximises probe life
Manufactured to high laboratory standards
Printed on the bottle label — follow Bluelab's product-specific manual for your pen or probe
- Never store or soak a pH probe in RO, distilled or deionised water. Pure water changes the chemistry in the probe's reference and kills it — this is the number one way growers destroy pH probes, and it's exactly what KCl solution exists to prevent.
- Keep a bottle next to your meter. The moment a probe comes out of the reservoir, rinse it in fresh tap water and put it back in a KCl-filled storage cap.
- If a probe has been left dry, don't bin it yet — clean it, soak the tip in KCl solution for at least 24 hours, then recalibrate. If calibration holds, it survived.
How to Use It
Pairs Well With
The instruments this solution keeps alive — pH PenPlus, pH Pen and the 2m BNC pH Probe.
pH Calibration SolutionspH 7.0 and 4.0 standards — hydration and calibration go together on every pH probe.
All BluelabMeters, monitors, controllers and care gear from the full Bluelab range.
Water ControlpH Up and Down, buffers and dosing gear for the whole reservoir routine.
Frequently Asked Questions
Can I store my pH probe in tap, RO or distilled water instead?
No. RO, distilled and deionised water change the chemistry in the probe's reference and permanently damage it — Bluelab is explicit on this. Tap water rinses are fine, but storage must be in KCl solution.
Which Bluelab products does it work with?
Bluelab specifies it for the pH Pen, Soil pH Pen, pH Probes and Soil pH Probes — any Bluelab pH instrument with a glass probe tip that stores wet.
How often should I hydrate my probe?
Bluelab recommends storing in KCl after every use and hydrating monthly, with a full 24-hour soak before first use or whenever a probe has been allowed to dry out. Pens also take 3–5 drops into the storage cap's wetting seal weekly.
Should I buy the sachet or a bottle?
The sachet covers a one-off hydration soak or a care-kit top-up. If you own a pH pen or probe, a bottle is the practical choice — storage is an every-use habit, and the 250ml works out far cheaper per ml for probes living in KCl year-round.
My probe dried out — is it dead?
Not necessarily. Clean the tip, soak it in KCl solution for at least 24 hours, then run a full 2-point calibration. If calibration succeeds and holds, the probe survived; if it won't calibrate or reads the same in every buffer, it's permanently damaged and needs replacing.
The Cheapest Insurance a pH Probe Can Get
Genuine Bluelab KCl solution — because a dry probe is a dead probe. Free shipping over $499*.
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