I can find t he Black Diamond filter information, but the description "Aqua 2.0 hp pump with ionizer" doesn't bring up anything specific unless this is it:

https://www.thepoolfactory.com/aquap...efc-motor.html

Is your pump a 2 speed pump? If so, you should always, ALWAYS run on 2-speed unless you have a specific need to do otherwise. You will get better filtration, better life out of your cartridge AND save substantially on electrical costs.

Ionizers aren't really compatible with chlorination. Copper stains, but copper staining can be avoided IF there's no chlorination AND the pH is kept low-ish. Add chlorine, and let the pH go up and you get stains.

BUT . . . many ionizers don't stain, because they don't actually work. (ie, they don't deliver any copper).