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Good point… you should also check your alk if you have another alk test kit. I recently discovered my Neptune alk was out of calibration. I thought I was in the mid 8’s and I was actually in the low 7’s. So verifying your apex reading with other test kits every few weeks or monthly can help.Do you have another pH probe to double check your current one? Seems odd to have ph that low with an Alk of 9.6.
I would pick up a handheld Hanna ph tester. And calibrate both the Apex and Hanna probes then check the water. If it’s actually that low then maybe look into sodium hydroxide for your Alk.