Problems with pH and redox probes: Customer service and solutions

Contact: Good day
I recently bought a pH probe and it's causing problems

Advisor: Hello
What seems to be the issue?

Contact: I have calibrated the probe multiple times, but the values deviate from the calibration by up to 1.0 within hours.
It was for a Bayrol Salt Relax Pro system.
You are sonde-ph-redox-piscine.fr, right?
The purchase was made on March 27, 2023.

Advisor: This is an unstable probe. It can happen from time to time. We will replace the probe for you. It will be shipped today or tomorrow.

Contact: Alright, but it caused so much pH Minus to be added that the pH dropped to 1.8. I had to empty and refill the entire pool, 30,000 liters, heat it up, add salt, etc.

Advisor: Unfortunately, your control system does not have a warning system.

Contact: Good day, Last year I bought a redox probe for a Bayrol Salt Relax Pro, but I only installed it three weeks ago. Initially, it was working correctly, but for the past few days, the redox value has been consistently showing 0. Since yesterday, it has been permanently showing 0. I suspect a defective electrode.

Advisor: Hello
Hold on
I can't find your order from last year.

Contact: Okay, let me check.

Advisor: email@email.com

Contact: Yes, possibly also in 2021, not sure anymore.
I found something from August 20, 2020.

Advisor: Not last year, three years ago.

Contact: Yes, you're right, but it was still in its original packaging until three weeks ago.

Advisor: Okay, unfortunately, the probes have expired... we only store them for 6 months at the factory.

Contact: Hmm, so you can't keep them in reserve?
After all, it did work for some time.

Advisor: No, a probe is like a battery. And they naturally discharge.

Contact: Okay, then please send me a new one, or provide a link to the correct product.

Advisor: https://ph-redox-pool.com/gb/bayrol/363-ORP-Probe-for-Salt-Relax-Pro.html