I bought a bottle of Vitalink PH Down.... opened it today, added the approximate amount to my water... reading? 7.2
Recalibrated my PH pen, it had drifted 0.2, so I was happy
PH tested the water again.... 7.0 FFS!
Looked at the bottle... then compared the bottle to my old one. This is 25% & the old one 81% - Never realised they did two different strengths and the difference on the bottle markings don't make it obvious
.... and that explains why I thought it was cheap
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