How do I measure ph?

Hello, The PH need to be checked on your water after adding your nutrients, now you water your plant and also check the PH from the drained water(i dont do this all the time, but from time to time or after transplant) by this for example you know that your water with nutrients had 6.0 PH for example, and the water drained had 5.5, now you know that the next water you can give is a 6.5 ph to increase the soils ph as the soil is getting a bit more acid, i also recomend to check from time to time the ppm with a tds meter from the water drained, by this you know if there are too much salt in your soil

I'm not sure about these smart folks but I am guessing they are talking about organic soil which is way different then coco. From what I understand is you always want a little bit of runoff with coco to avoid salt buildup's which can cause nutrient lockout. As for PH they are correct. What you do want to keep an eye on is the EC/PPM of what you have going in to the EC/PPM going out to have an idea of how much she is eating and if you should increase/decrease nutrients. Remember EC in mixes with the current EC in the coco and then exits. So if you put .600 ec in for 2 weeks then increase the feeding to .1000 your ec out will gradually get to 1000 after several feeds and not right away. Here is a copy and paste from a web site: Although it is critical to adjust the pH of the inflow, you should not be concerned with the pH of the run-off water. Your only concern with pH is always providing nutrient solution (inflow) that is in the appropriate range. Many growers make the bad decision to provide nutrient solution that is outside of the acceptable range in a misguided attempt to correct run-off pH values. This can destabilize the pH of the nutrient solution in the root zone and make nutrients unavailable. To avoid this common pitfall, simply ignore the pH of the run-off.