I didn’t pH my water until I was spraying my sprouts. Not sure it matters for the seed hatch?
Rainwater is usually a good neutral pH. There is a pretty good topic on that already. I will see if I can find it and link it here.
The ph adjusters for pools… I’m not sure about those. What’s in them? (Anyone else doing that?) I believe that the ph up & down used to adjust fish tanks is the same stuff as what I recommend:
ph and tds meters
ph up & Down
If you’re doing added nutrients to your soil at some point you would need to know the TDS as well as the pH