Water monitoring

[mark]

Never had much luck with pH test kits that made you guess a colour for a value, with Hagen probably the worst though did find Salifert a little better. Ended up just getting a pH probe and meter.

Ca, Mg, Alk is easy with Salifert or Elos as it's a clear change (pink to blue).

For NO3 still guessing shades of pink but switched to Salifert and again seem to find easier to judge than the Hagen.