What maintenance do you need to do? Other than the PH probe, maybe replace the lines? I have the chart as to what pump head needs what if you want I can post… but to answer you, yes Thera would be your contact I assume.Hey everyone, I just picked up a used KH Carer and Avast K1 off Facebook marketplace for an absolutely absurd price... like, too good to pass up. The seller admitted the pH probe needed to be replaced, and I want to do some routine maintenance before I set it up. Is [email protected] still the go to person? I'm wondering if I need to do some of the updates mentioned in previous posts beforehand as well. Finally, any tips for using it?