Argh! Bloody pH! Farting about with the pH down, get my solution down to 5.9, leave it for a bit, stir, still 5.9, so I stir it leave it again. Still 5.9. So I put one tiny tiny pin point drop of pH down in it. 5.6, the bastard pH went down to 5.6. FUUUUUUUUUUUUUUUUUUU!!!!