1diesel1
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Lol man, some of these threads kill me. I was going to reply but by the time I got to the bottom I forgot what the damn thread was about haha.
You cant ph RO. There is no ions or cations in it. No ions or cations=no potential hydrogen to measure.
There is also no need to if you are using a soiless mix. Peat is not inert like rockwool, it has a cation exchange capacity and so it holds nutrients. As soon as you water it with RO, the water will take on the nutrients and then buffer to whatever the ph of the soil is. I always use either straight RO or rainwater for my last 2 weeks of bloom and have never had an issue, just delicious clean burning buds.
As for the ph meter. A rinse is fine with RO, just dont store it in there. The osmotic pressure will draw the KCL out of the probe bulb and cause it to read slow. Store it in KCL storage solution or ph4 buffer solution.
What happens when you ph RO water?