PH problems

[Maxs]

Hello, Can anyone advise me on PH problems, I grow in Coco and because my tap water is ph7.2 I use ph down to raise the acidity to 6.0 but lately my young ones are not growing as they should, so I checked the run of and found a ph of 3.5, should I stop using the ph down and use something to raise the ph?

[Mr.furley]

Hello Maxs
pictures would really help to give the best advice.
don't raise the PH, just give them the 7.2 water and stop PH down for a bit.

[Obi-Wan]

Are you adjusting the pH after you add nutrients? My tap is also around 7.2 but my pH after adding nutrients is normally 6.2. I grow in dwc but the only difference would be your water only days.

[PhantomSulker]

I just learned the hard way again, I was checking my PH after adding nutes and adjusting the PH with Up/Down. A few weeks ago it seemed to be I was making more adjustments. I checked the PH with my chemicals and the meter was saying 5.8 and the water was actually below any reading on the chart. I dumped that out and mixed up new batch and used my chemicals to measure. I ordered a $36 well reviewed meter and when it came I tested the 2 meters and the other was 2 off. Long story short I almost killed 3 plants. Get a good meter and make sure it is calibrated. The other thing I have been told many times in coco fluctuate your PH as well. 5.5 to 6.5 in coco. Good luck growing!