How do I permanently get rid of this discolouration in my bathtub? (I have hard water) ( sh.itjust.works )

NOT_RICK , 1 month ago

I would think you would need a filtration system to soften your water or it will just keep coming back.

I’ve had luck with citric acid on removing scale, but be sure to test a small part of your tub before using any new product to be sure it won’t damage the finish.

SoySaucePrinterInk OP , 26 days ago

Unfortunately we do have a water softener but for some reason, there's still buildup.

I've been seeing improvements with powdered bar keepers friend but it takes several passes and still comes back unfortunately.