IsanFarmer
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I have the same pen and it behaves similarly. I guess I don't quite understand the problem. You bought an RO machine to get rid of the TDS in your tap water. It does its job so well that the pen can't measure it. That's good, right?
I understand your point. I was conflating TDS and pH. Sorry for the confusion. If you mix up a batch of nutes, do you get a good pH reading? I'd be tempted to check the pH of the RO water with cheap test strips.I use RO water from machines in the street. They're everywhere in Thailand. I use RO water to save me the trouble of taking chlorine out of tap water. If the reading on my pen keeps dropping until it switches itself off, how can you be sure what the reading is? Isn't the reading supposed to stop at some point so you know that's what the reading is? If the reading keeps dropping until the pen switches off, how can you be sure it wouldn't have continued to do that if the pen hadn't switched off? The reading on my pen drops by .1 approximately every 30 seconds until the pen switches off after 4 minutes. Is it a safe enough assumption that if the pen switches itself off after 6 minutes the reading would have dropped another .4 by then? If the pen can't give me an accurate reading for the PH, how is that good?
I understand your point. I was conflating TDS and pH. Sorry for the confusion. If you mix up a batch of nutes, do you get a good pH reading? I'd be tempted to check the pH of the RO water with cheap test strips.
Yeah, I get good stable pH readings once I've mixed up a batch. Again, I was thinking TDS when you were talking about pH. My bad. The Blue Lab website says RO water can cause permanent damage if you use it to hydrate the probe. Maybe that's what you're dealing with. https://support.bluelab.com/hydrate-bluelab-ph-penYes I wondered why you mentioned TDS and no, when I was mixing up some nutes the other day the pen was doing the same thing. I think it's fucked. I bet I've got you thinking now if your pen behaves the same way? If it does, at what point do you satisfy yourself that the reading you get is correct? Do you use RO water as well?
I've done a lot of research today into RO water and cannabis cultivation and I've reached the conclusion I should stop using it immediately. I think it's fucked my PH pen and I need to replace it, which is a bastard because it's an expensive one and I've barely used it.
Yeah, I get good stable pH readings once I've mixed up a batch. Again, I was thinking TDS when you were talking about pH. My bad. The Blue Lab website says RO water can cause permanent damage if you use it to hydrate the probe. Maybe that's what you're dealing with. https://support.bluelab.com/hydrate-bluelab-ph-pen
RO - molten hydrogen oxide. That is all.
To read pH in RO water add a small quantity of table salt, pinch. Anything that ionizes in water. That will stabilize the probe.
Take RO water and pass it over 5 or 6 multi effect still.
Zill.
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